diff --git a/.php_cs b/.php_cs
index 4e789bc2..708db060 100644
--- a/.php_cs
+++ b/.php_cs
@@ -1,24 +1,24 @@
 <?php
 
-$finder = Symfony\CS\Finder\DefaultFinder::create()
-    ->files()
-    ->name('*.php')
-    ->name('*.phpt')
-    ->in('library')
-    ->in('tests');
-
-return Symfony\CS\Config\Config::create()
-    ->level(\Symfony\CS\FixerInterface::SYMFONY_LEVEL)
-    ->fixers(array(
-        'empty_return',
-        'mb_str_functions',
-        'multiline_spaces_before_semicolon',
-        'newline_after_open_tag',
-        'no_useless_else',
-        'no_useless_return',
-        'ordered_use',
-        'phpdoc_order',
-        'short_array_syntax',
-    ))
-    ->setUsingCache(true)
-    ->finder($finder);
+return PhpCsFixer\Config::create()
+    ->setRiskyAllowed(true)
+    ->setRules([
+        '@Symfony' => true,
+        '@PHP71Migration:risky' => true,
+        'phpdoc_align' => false,
+        'phpdoc_summary' => false,
+        'mb_str_functions' => true,
+        'no_multiline_whitespace_before_semicolons' => true,
+        'no_useless_else' => true,
+        'no_useless_return' => true,
+        'ordered_imports' => true,
+        'phpdoc_order' => true,
+        'array_syntax' => ['syntax' => 'short'],
+        'no_short_echo_tag' => true,
+    ])
+    ->setFinder(
+        PhpCsFixer\Finder::create()
+            ->in(['library', 'tests'])
+            ->name('*.php')
+            ->name('*.phpt')
+    );
diff --git a/composer.json b/composer.json
index 586cdff1..df537e42 100644
--- a/composer.json
+++ b/composer.json
@@ -17,6 +17,7 @@
     },
     "require-dev": {
         "egulias/email-validator": "^2.0",
+        "friendsofphp/php-cs-fixer": "^2.8",
         "malukenho/docheader": "^0.1.4",
         "mikey179/vfsStream": "^1.6",
         "phpunit/phpunit": "^6.4",
diff --git a/library/Exceptions/AgeException.php b/library/Exceptions/AgeException.php
index 1beccc6f..d4239e9b 100644
--- a/library/Exceptions/AgeException.php
+++ b/library/Exceptions/AgeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions;
 
 class AgeException extends NestedValidationException
diff --git a/library/Exceptions/AllOfException.php b/library/Exceptions/AllOfException.php
index 73c93b91..0e0cfcbc 100644
--- a/library/Exceptions/AllOfException.php
+++ b/library/Exceptions/AllOfException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions;
 
 class AllOfException extends GroupedValidationException
diff --git a/library/Exceptions/AlnumException.php b/library/Exceptions/AlnumException.php
index b082551c..92f1a8da 100644
--- a/library/Exceptions/AlnumException.php
+++ b/library/Exceptions/AlnumException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions;
 
 class AlnumException extends AlphaException
diff --git a/library/Exceptions/AlphaException.php b/library/Exceptions/AlphaException.php
index 78161303..728e90a0 100644
--- a/library/Exceptions/AlphaException.php
+++ b/library/Exceptions/AlphaException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions;
 
 class AlphaException extends ValidationException
diff --git a/library/Exceptions/AlwaysInvalidException.php b/library/Exceptions/AlwaysInvalidException.php
index cd44ddf7..d8af74c8 100644
--- a/library/Exceptions/AlwaysInvalidException.php
+++ b/library/Exceptions/AlwaysInvalidException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions;
 
 class AlwaysInvalidException extends ValidationException
diff --git a/library/Exceptions/AlwaysValidException.php b/library/Exceptions/AlwaysValidException.php
index 4416e469..56b45e4e 100644
--- a/library/Exceptions/AlwaysValidException.php
+++ b/library/Exceptions/AlwaysValidException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions;
 
 class AlwaysValidException extends ValidationException
diff --git a/library/Exceptions/AnyOfException.php b/library/Exceptions/AnyOfException.php
index db47ff7c..ddf7a935 100644
--- a/library/Exceptions/AnyOfException.php
+++ b/library/Exceptions/AnyOfException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions;
 
 class AnyOfException extends NestedValidationException
diff --git a/library/Exceptions/ArrayTypeException.php b/library/Exceptions/ArrayTypeException.php
index 2c6d19c1..d9e1a4e3 100644
--- a/library/Exceptions/ArrayTypeException.php
+++ b/library/Exceptions/ArrayTypeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions;
 
 class ArrayTypeException extends ValidationException
diff --git a/library/Exceptions/ArrayValException.php b/library/Exceptions/ArrayValException.php
index 5bd9bdb6..de1228c1 100644
--- a/library/Exceptions/ArrayValException.php
+++ b/library/Exceptions/ArrayValException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions;
 
 class ArrayValException extends ValidationException
diff --git a/library/Exceptions/AtLeastException.php b/library/Exceptions/AtLeastException.php
index d9e0743a..96f600af 100644
--- a/library/Exceptions/AtLeastException.php
+++ b/library/Exceptions/AtLeastException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions;
 
 class AtLeastException extends GroupedValidationException
diff --git a/library/Exceptions/AttributeException.php b/library/Exceptions/AttributeException.php
index ab9b826a..b7680824 100644
--- a/library/Exceptions/AttributeException.php
+++ b/library/Exceptions/AttributeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions;
 
 class AttributeException extends NestedValidationException implements NonOmissibleExceptionInterface
diff --git a/library/Exceptions/Base64Exception.php b/library/Exceptions/Base64Exception.php
index ef54f42b..0a08bb60 100644
--- a/library/Exceptions/Base64Exception.php
+++ b/library/Exceptions/Base64Exception.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions;
 
 class Base64Exception extends ValidationException
diff --git a/library/Exceptions/BaseException.php b/library/Exceptions/BaseException.php
index cd913fb6..e026d141 100644
--- a/library/Exceptions/BaseException.php
+++ b/library/Exceptions/BaseException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions;
 
 class BaseException extends ValidationException
diff --git a/library/Exceptions/BetweenException.php b/library/Exceptions/BetweenException.php
index 0e0b2513..4412cafe 100644
--- a/library/Exceptions/BetweenException.php
+++ b/library/Exceptions/BetweenException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions;
 
 class BetweenException extends NestedValidationException
diff --git a/library/Exceptions/BoolTypeException.php b/library/Exceptions/BoolTypeException.php
index ece8aec4..d0fcd96f 100644
--- a/library/Exceptions/BoolTypeException.php
+++ b/library/Exceptions/BoolTypeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions;
 
 class BoolTypeException extends ValidationException
diff --git a/library/Exceptions/BoolValException.php b/library/Exceptions/BoolValException.php
index bb2ab436..464f1f8b 100644
--- a/library/Exceptions/BoolValException.php
+++ b/library/Exceptions/BoolValException.php
@@ -1,4 +1,5 @@
 <?php
+
 /*
  * This file is part of Respect/Validation.
  *
@@ -8,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions;
 
 class BoolValException extends ValidationException
diff --git a/library/Exceptions/BsnException.php b/library/Exceptions/BsnException.php
index 89e0ad93..74de6edf 100644
--- a/library/Exceptions/BsnException.php
+++ b/library/Exceptions/BsnException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions;
 
 /**
diff --git a/library/Exceptions/CallException.php b/library/Exceptions/CallException.php
index 5504d8b1..d9dc2abc 100644
--- a/library/Exceptions/CallException.php
+++ b/library/Exceptions/CallException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions;
 
 class CallException extends GroupedValidationException implements NonOmissibleExceptionInterface
diff --git a/library/Exceptions/CallableTypeException.php b/library/Exceptions/CallableTypeException.php
index 5c24875c..9f5dc6e7 100644
--- a/library/Exceptions/CallableTypeException.php
+++ b/library/Exceptions/CallableTypeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions;
 
 /**
diff --git a/library/Exceptions/CallbackException.php b/library/Exceptions/CallbackException.php
index 40ec0815..b42211b1 100644
--- a/library/Exceptions/CallbackException.php
+++ b/library/Exceptions/CallbackException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions;
 
 class CallbackException extends NestedValidationException
diff --git a/library/Exceptions/CharsetException.php b/library/Exceptions/CharsetException.php
index fcf95f4f..7f501ae6 100644
--- a/library/Exceptions/CharsetException.php
+++ b/library/Exceptions/CharsetException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions;
 
 class CharsetException extends ValidationException
diff --git a/library/Exceptions/CnhException.php b/library/Exceptions/CnhException.php
index 9ace46c5..39af34bc 100644
--- a/library/Exceptions/CnhException.php
+++ b/library/Exceptions/CnhException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions;
 
 class CnhException extends ValidationException
diff --git a/library/Exceptions/CnpjException.php b/library/Exceptions/CnpjException.php
index 28115dc1..bd4fecac 100644
--- a/library/Exceptions/CnpjException.php
+++ b/library/Exceptions/CnpjException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions;
 
 class CnpjException extends ValidationException
diff --git a/library/Exceptions/CntrlException.php b/library/Exceptions/CntrlException.php
index 8b280b5e..97874405 100644
--- a/library/Exceptions/CntrlException.php
+++ b/library/Exceptions/CntrlException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions;
 
 class CntrlException extends AlphaException
diff --git a/library/Exceptions/ComponentException.php b/library/Exceptions/ComponentException.php
index b8f572aa..74607145 100644
--- a/library/Exceptions/ComponentException.php
+++ b/library/Exceptions/ComponentException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions;
 
 use Exception;
diff --git a/library/Exceptions/ConsonantException.php b/library/Exceptions/ConsonantException.php
index 56ff774f..7bca06b9 100644
--- a/library/Exceptions/ConsonantException.php
+++ b/library/Exceptions/ConsonantException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions;
 
 class ConsonantException extends AlphaException
diff --git a/library/Exceptions/ContainsException.php b/library/Exceptions/ContainsException.php
index 2c3060c3..b86e7c58 100644
--- a/library/Exceptions/ContainsException.php
+++ b/library/Exceptions/ContainsException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions;
 
 class ContainsException extends ValidationException
diff --git a/library/Exceptions/CountableException.php b/library/Exceptions/CountableException.php
index ab18743e..a3b5c727 100644
--- a/library/Exceptions/CountableException.php
+++ b/library/Exceptions/CountableException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions;
 
 class CountableException extends ValidationException
diff --git a/library/Exceptions/CountryCodeException.php b/library/Exceptions/CountryCodeException.php
index d3281721..c86b5335 100644
--- a/library/Exceptions/CountryCodeException.php
+++ b/library/Exceptions/CountryCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions;
 
 class CountryCodeException extends ValidationException
diff --git a/library/Exceptions/CpfException.php b/library/Exceptions/CpfException.php
index e66f688e..dce1ed2b 100644
--- a/library/Exceptions/CpfException.php
+++ b/library/Exceptions/CpfException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions;
 
 class CpfException extends ValidationException
diff --git a/library/Exceptions/CreditCardException.php b/library/Exceptions/CreditCardException.php
index e6c6de9b..e08c4420 100644
--- a/library/Exceptions/CreditCardException.php
+++ b/library/Exceptions/CreditCardException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions;
 
 class CreditCardException extends ValidationException
diff --git a/library/Exceptions/CurrencyCodeException.php b/library/Exceptions/CurrencyCodeException.php
index 5d97f641..46a793ed 100644
--- a/library/Exceptions/CurrencyCodeException.php
+++ b/library/Exceptions/CurrencyCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions;
 
 class CurrencyCodeException extends ValidationException
diff --git a/library/Exceptions/DateTimeException.php b/library/Exceptions/DateTimeException.php
index f2da1a62..257616d2 100644
--- a/library/Exceptions/DateTimeException.php
+++ b/library/Exceptions/DateTimeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions;
 
 class DateTimeException extends ValidationException
@@ -29,7 +31,7 @@ class DateTimeException extends ValidationException
     public function configure($name, array $params = [])
     {
         $params['format'] = date(
-            $params['format'],
+            (string) $params['format'],
             strtotime('2005-12-30 01:02:03')
         );
 
diff --git a/library/Exceptions/DigitException.php b/library/Exceptions/DigitException.php
index 981b2865..616c4dc7 100644
--- a/library/Exceptions/DigitException.php
+++ b/library/Exceptions/DigitException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions;
 
 class DigitException extends AlphaException
diff --git a/library/Exceptions/DirectoryException.php b/library/Exceptions/DirectoryException.php
index 362d1bbe..a1e0ea47 100644
--- a/library/Exceptions/DirectoryException.php
+++ b/library/Exceptions/DirectoryException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions;
 
 class DirectoryException extends ValidationException
diff --git a/library/Exceptions/DomainException.php b/library/Exceptions/DomainException.php
index 333bb5f9..e30be8c6 100644
--- a/library/Exceptions/DomainException.php
+++ b/library/Exceptions/DomainException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions;
 
 class DomainException extends NestedValidationException
diff --git a/library/Exceptions/EachException.php b/library/Exceptions/EachException.php
index 0fe07d22..d9a5766a 100644
--- a/library/Exceptions/EachException.php
+++ b/library/Exceptions/EachException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions;
 
 class EachException extends NestedValidationException
diff --git a/library/Exceptions/EmailException.php b/library/Exceptions/EmailException.php
index 9cb357ec..c5983252 100644
--- a/library/Exceptions/EmailException.php
+++ b/library/Exceptions/EmailException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions;
 
 class EmailException extends ValidationException
diff --git a/library/Exceptions/EndsWithException.php b/library/Exceptions/EndsWithException.php
index 319d817b..a7acea72 100644
--- a/library/Exceptions/EndsWithException.php
+++ b/library/Exceptions/EndsWithException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions;
 
 class EndsWithException extends ValidationException
diff --git a/library/Exceptions/EqualsException.php b/library/Exceptions/EqualsException.php
index 0a34c342..b8b07d55 100644
--- a/library/Exceptions/EqualsException.php
+++ b/library/Exceptions/EqualsException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions;
 
 class EqualsException extends ValidationException
diff --git a/library/Exceptions/EvenException.php b/library/Exceptions/EvenException.php
index 73e26bfa..12a0252c 100644
--- a/library/Exceptions/EvenException.php
+++ b/library/Exceptions/EvenException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions;
 
 class EvenException extends ValidationException
diff --git a/library/Exceptions/ExceptionInterface.php b/library/Exceptions/ExceptionInterface.php
index 3e0bdd54..1687f750 100644
--- a/library/Exceptions/ExceptionInterface.php
+++ b/library/Exceptions/ExceptionInterface.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions;
 
 interface ExceptionInterface
diff --git a/library/Exceptions/ExecutableException.php b/library/Exceptions/ExecutableException.php
index bfe83714..201d0008 100644
--- a/library/Exceptions/ExecutableException.php
+++ b/library/Exceptions/ExecutableException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions;
 
 class ExecutableException extends ValidationException
diff --git a/library/Exceptions/ExistsException.php b/library/Exceptions/ExistsException.php
index 66ea3e5a..b37451f7 100644
--- a/library/Exceptions/ExistsException.php
+++ b/library/Exceptions/ExistsException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions;
 
 class ExistsException extends ValidationException
diff --git a/library/Exceptions/ExtensionException.php b/library/Exceptions/ExtensionException.php
index 5129a016..c8f48c0f 100644
--- a/library/Exceptions/ExtensionException.php
+++ b/library/Exceptions/ExtensionException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions;
 
 /**
diff --git a/library/Exceptions/FactorException.php b/library/Exceptions/FactorException.php
index 8ee27642..d91221e0 100644
--- a/library/Exceptions/FactorException.php
+++ b/library/Exceptions/FactorException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions;
 
 /**
diff --git a/library/Exceptions/FalseValException.php b/library/Exceptions/FalseValException.php
index 2813e3b4..11564734 100644
--- a/library/Exceptions/FalseValException.php
+++ b/library/Exceptions/FalseValException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions;
 
 class FalseValException extends ValidationException
diff --git a/library/Exceptions/FibonacciException.php b/library/Exceptions/FibonacciException.php
index eec1b28f..c2f6996c 100644
--- a/library/Exceptions/FibonacciException.php
+++ b/library/Exceptions/FibonacciException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions;
 
 class FibonacciException extends ValidationException
diff --git a/library/Exceptions/FileException.php b/library/Exceptions/FileException.php
index b76f3cef..f97f72fa 100644
--- a/library/Exceptions/FileException.php
+++ b/library/Exceptions/FileException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions;
 
 class FileException extends ValidationException
diff --git a/library/Exceptions/FilterVarException.php b/library/Exceptions/FilterVarException.php
index 1bfc4c11..3e15db32 100644
--- a/library/Exceptions/FilterVarException.php
+++ b/library/Exceptions/FilterVarException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions;
 
 class FilterVarException extends ValidationException
diff --git a/library/Exceptions/FiniteException.php b/library/Exceptions/FiniteException.php
index 8bf2ae08..c7c69911 100644
--- a/library/Exceptions/FiniteException.php
+++ b/library/Exceptions/FiniteException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions;
 
 /**
diff --git a/library/Exceptions/FloatTypeException.php b/library/Exceptions/FloatTypeException.php
index 178f2a6b..3e9b7df4 100644
--- a/library/Exceptions/FloatTypeException.php
+++ b/library/Exceptions/FloatTypeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions;
 
 class FloatTypeException extends ValidationException
diff --git a/library/Exceptions/FloatValException.php b/library/Exceptions/FloatValException.php
index 9ea6cbb3..f75961d0 100644
--- a/library/Exceptions/FloatValException.php
+++ b/library/Exceptions/FloatValException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions;
 
 class FloatValException extends ValidationException
diff --git a/library/Exceptions/GraphException.php b/library/Exceptions/GraphException.php
index e058ab59..ac7c315f 100644
--- a/library/Exceptions/GraphException.php
+++ b/library/Exceptions/GraphException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions;
 
 class GraphException extends AlphaException
diff --git a/library/Exceptions/GroupedValidationException.php b/library/Exceptions/GroupedValidationException.php
index 0efb41f7..83583a07 100644
--- a/library/Exceptions/GroupedValidationException.php
+++ b/library/Exceptions/GroupedValidationException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions;
 
 class GroupedValidationException extends NestedValidationException
diff --git a/library/Exceptions/HexRgbColorException.php b/library/Exceptions/HexRgbColorException.php
index 9c5a96ab..2b55c8f6 100644
--- a/library/Exceptions/HexRgbColorException.php
+++ b/library/Exceptions/HexRgbColorException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions;
 
 class HexRgbColorException extends ValidationException
diff --git a/library/Exceptions/IdenticalException.php b/library/Exceptions/IdenticalException.php
index 8e920722..2e811f58 100644
--- a/library/Exceptions/IdenticalException.php
+++ b/library/Exceptions/IdenticalException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions;
 
 class IdenticalException extends ValidationException
diff --git a/library/Exceptions/IdentityCardException.php b/library/Exceptions/IdentityCardException.php
index 94d6d0af..0d4f74e4 100644
--- a/library/Exceptions/IdentityCardException.php
+++ b/library/Exceptions/IdentityCardException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions;
 
 class IdentityCardException extends ValidationException
diff --git a/library/Exceptions/ImageException.php b/library/Exceptions/ImageException.php
index 0934de8b..399c5da0 100644
--- a/library/Exceptions/ImageException.php
+++ b/library/Exceptions/ImageException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions;
 
 class ImageException extends ValidationException
diff --git a/library/Exceptions/ImeiException.php b/library/Exceptions/ImeiException.php
index 11a7b5ce..953de513 100644
--- a/library/Exceptions/ImeiException.php
+++ b/library/Exceptions/ImeiException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions;
 
 class ImeiException extends ValidationException
diff --git a/library/Exceptions/InException.php b/library/Exceptions/InException.php
index d1728b10..756f0113 100644
--- a/library/Exceptions/InException.php
+++ b/library/Exceptions/InException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions;
 
 class InException extends ValidationException
diff --git a/library/Exceptions/InfiniteException.php b/library/Exceptions/InfiniteException.php
index 8587a79f..a58a10b7 100644
--- a/library/Exceptions/InfiniteException.php
+++ b/library/Exceptions/InfiniteException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions;
 
 /**
diff --git a/library/Exceptions/InstanceException.php b/library/Exceptions/InstanceException.php
index 86737e3f..422b392c 100644
--- a/library/Exceptions/InstanceException.php
+++ b/library/Exceptions/InstanceException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions;
 
 class InstanceException extends ValidationException
diff --git a/library/Exceptions/IntTypeException.php b/library/Exceptions/IntTypeException.php
index 6c299d29..c3b8eab6 100644
--- a/library/Exceptions/IntTypeException.php
+++ b/library/Exceptions/IntTypeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions;
 
 class IntTypeException extends ValidationException
diff --git a/library/Exceptions/IntValException.php b/library/Exceptions/IntValException.php
index 933dbf60..a67dc8db 100644
--- a/library/Exceptions/IntValException.php
+++ b/library/Exceptions/IntValException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions;
 
 class IntValException extends ValidationException
diff --git a/library/Exceptions/IpException.php b/library/Exceptions/IpException.php
index 59ee9508..86c0bfaf 100644
--- a/library/Exceptions/IpException.php
+++ b/library/Exceptions/IpException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions;
 
 class IpException extends ValidationException
diff --git a/library/Exceptions/IterableTypeException.php b/library/Exceptions/IterableTypeException.php
index 94bb7bec..61fcfc66 100644
--- a/library/Exceptions/IterableTypeException.php
+++ b/library/Exceptions/IterableTypeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions;
 
 class IterableTypeException extends ValidationException
diff --git a/library/Exceptions/JsonException.php b/library/Exceptions/JsonException.php
index bad8ae26..9f2df4dc 100644
--- a/library/Exceptions/JsonException.php
+++ b/library/Exceptions/JsonException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions;
 
 class JsonException extends ValidationException
diff --git a/library/Exceptions/KeyException.php b/library/Exceptions/KeyException.php
index 6316fc6e..ba359d17 100644
--- a/library/Exceptions/KeyException.php
+++ b/library/Exceptions/KeyException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions;
 
 class KeyException extends AttributeException implements NonOmissibleExceptionInterface
diff --git a/library/Exceptions/KeyNestedException.php b/library/Exceptions/KeyNestedException.php
index 57497b01..4fa80274 100644
--- a/library/Exceptions/KeyNestedException.php
+++ b/library/Exceptions/KeyNestedException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions;
 
 class KeyNestedException extends AttributeException implements NonOmissibleExceptionInterface
diff --git a/library/Exceptions/KeySetException.php b/library/Exceptions/KeySetException.php
index 6e5dc214..165a3bc0 100644
--- a/library/Exceptions/KeySetException.php
+++ b/library/Exceptions/KeySetException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions;
 
 class KeySetException extends GroupedValidationException implements NonOmissibleExceptionInterface
diff --git a/library/Exceptions/KeyValueException.php b/library/Exceptions/KeyValueException.php
index dde31e93..40e577d3 100644
--- a/library/Exceptions/KeyValueException.php
+++ b/library/Exceptions/KeyValueException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions;
 
 class KeyValueException extends ValidationException
diff --git a/library/Exceptions/LanguageCodeException.php b/library/Exceptions/LanguageCodeException.php
index 5471b8c7..e4e52215 100644
--- a/library/Exceptions/LanguageCodeException.php
+++ b/library/Exceptions/LanguageCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions;
 
 class LanguageCodeException extends ValidationException
diff --git a/library/Exceptions/LeapDateException.php b/library/Exceptions/LeapDateException.php
index bc4bdea4..59402a09 100644
--- a/library/Exceptions/LeapDateException.php
+++ b/library/Exceptions/LeapDateException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions;
 
 class LeapDateException extends ValidationException
diff --git a/library/Exceptions/LeapYearException.php b/library/Exceptions/LeapYearException.php
index e64e5ca3..46916467 100644
--- a/library/Exceptions/LeapYearException.php
+++ b/library/Exceptions/LeapYearException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions;
 
 class LeapYearException extends ValidationException
diff --git a/library/Exceptions/LengthException.php b/library/Exceptions/LengthException.php
index 708b0a53..50b0865f 100644
--- a/library/Exceptions/LengthException.php
+++ b/library/Exceptions/LengthException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions;
 
 class LengthException extends ValidationException
diff --git a/library/Exceptions/Locale/PlIdentityCardException.php b/library/Exceptions/Locale/PlIdentityCardException.php
index b2b07555..37213373 100644
--- a/library/Exceptions/Locale/PlIdentityCardException.php
+++ b/library/Exceptions/Locale/PlIdentityCardException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\Locale;
 
 use Respect\Validation\Exceptions\ValidationException;
diff --git a/library/Exceptions/Locale/PlVatinException.php b/library/Exceptions/Locale/PlVatinException.php
index 343fe52c..ae4ecd19 100644
--- a/library/Exceptions/Locale/PlVatinException.php
+++ b/library/Exceptions/Locale/PlVatinException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\Locale;
 
 use Respect\Validation\Exceptions\ValidationException;
diff --git a/library/Exceptions/LowercaseException.php b/library/Exceptions/LowercaseException.php
index 2971869f..16ac44ae 100644
--- a/library/Exceptions/LowercaseException.php
+++ b/library/Exceptions/LowercaseException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions;
 
 class LowercaseException extends ValidationException
diff --git a/library/Exceptions/LuhnException.php b/library/Exceptions/LuhnException.php
index 2289a037..57452b4a 100644
--- a/library/Exceptions/LuhnException.php
+++ b/library/Exceptions/LuhnException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions;
 
 class LuhnException extends ValidationException
diff --git a/library/Exceptions/MacAddressException.php b/library/Exceptions/MacAddressException.php
index 194b7dc7..8790f1e1 100644
--- a/library/Exceptions/MacAddressException.php
+++ b/library/Exceptions/MacAddressException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions;
 
 class MacAddressException extends ValidationException
diff --git a/library/Exceptions/MaxException.php b/library/Exceptions/MaxException.php
index 2a46cdfb..2bf8fd77 100644
--- a/library/Exceptions/MaxException.php
+++ b/library/Exceptions/MaxException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions;
 
 class MaxException extends ValidationException
diff --git a/library/Exceptions/MimetypeException.php b/library/Exceptions/MimetypeException.php
index 4ca57cfd..7fb89100 100644
--- a/library/Exceptions/MimetypeException.php
+++ b/library/Exceptions/MimetypeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions;
 
 /**
diff --git a/library/Exceptions/MinException.php b/library/Exceptions/MinException.php
index 08c99867..ec1073f2 100644
--- a/library/Exceptions/MinException.php
+++ b/library/Exceptions/MinException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions;
 
 class MinException extends ValidationException
diff --git a/library/Exceptions/MinimumAgeException.php b/library/Exceptions/MinimumAgeException.php
index ac3f24ac..3cc8805e 100644
--- a/library/Exceptions/MinimumAgeException.php
+++ b/library/Exceptions/MinimumAgeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions;
 
 class MinimumAgeException extends ValidationException
diff --git a/library/Exceptions/MostOfException.php b/library/Exceptions/MostOfException.php
index 0379da15..60a28c24 100644
--- a/library/Exceptions/MostOfException.php
+++ b/library/Exceptions/MostOfException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions;
 
 class MostOfException extends AtLeastException
diff --git a/library/Exceptions/MultipleException.php b/library/Exceptions/MultipleException.php
index 97668bca..55acab72 100644
--- a/library/Exceptions/MultipleException.php
+++ b/library/Exceptions/MultipleException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions;
 
 class MultipleException extends ValidationException
diff --git a/library/Exceptions/NegativeException.php b/library/Exceptions/NegativeException.php
index e2229663..fd242ee2 100644
--- a/library/Exceptions/NegativeException.php
+++ b/library/Exceptions/NegativeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions;
 
 class NegativeException extends ValidationException
diff --git a/library/Exceptions/NestedValidationException.php b/library/Exceptions/NestedValidationException.php
index e7a34ac4..cea335e5 100644
--- a/library/Exceptions/NestedValidationException.php
+++ b/library/Exceptions/NestedValidationException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions;
 
 use IteratorAggregate;
@@ -139,7 +141,7 @@ class NestedValidationException extends ValidationException implements IteratorA
         $relatedExceptions->rewind();
         $childException = $relatedExceptions->current();
 
-        return $relatedExceptions->count() === 1 && !$childException instanceof NonOmissibleExceptionInterface;
+        return 1 === $relatedExceptions->count() && !$childException instanceof NonOmissibleExceptionInterface;
     }
 
     /**
@@ -166,7 +168,7 @@ class NestedValidationException extends ValidationException implements IteratorA
             if (isset($knownDepths[$currentDepthOriginal])) {
                 $currentDepth = $knownDepths[$currentDepthOriginal];
             } elseif ($currentDepthOriginal > $lastDepthOriginal
-                && ($this->hasCustomTemplate() || $exceptionIterator->count() != 1)) {
+                && ($this->hasCustomTemplate() || 1 != $exceptionIterator->count())) {
                 ++$currentDepth;
             }
 
@@ -217,7 +219,7 @@ class NestedValidationException extends ValidationException implements IteratorA
         $messages = [];
         $exceptions = $this->getIterator();
 
-        if ($this->hasCustomTemplate() || count($exceptions) != 1) {
+        if ($this->hasCustomTemplate() || 1 != count($exceptions)) {
             $messages[] = sprintf('%s %s', $marker, $this->getMessage());
         }
 
diff --git a/library/Exceptions/NfeAccessKeyException.php b/library/Exceptions/NfeAccessKeyException.php
index 349bdf24..78521a72 100644
--- a/library/Exceptions/NfeAccessKeyException.php
+++ b/library/Exceptions/NfeAccessKeyException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions;
 
 class NfeAccessKeyException extends ValidationException
diff --git a/library/Exceptions/NifException.php b/library/Exceptions/NifException.php
index e0ac6f8c..b4b4ddc5 100644
--- a/library/Exceptions/NifException.php
+++ b/library/Exceptions/NifException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions;
 
 /**
diff --git a/library/Exceptions/NoException.php b/library/Exceptions/NoException.php
index 617ec3c2..73166538 100644
--- a/library/Exceptions/NoException.php
+++ b/library/Exceptions/NoException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions;
 
 class NoException extends ValidationException
diff --git a/library/Exceptions/NoWhitespaceException.php b/library/Exceptions/NoWhitespaceException.php
index 01b65c8e..b8ac49b5 100644
--- a/library/Exceptions/NoWhitespaceException.php
+++ b/library/Exceptions/NoWhitespaceException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions;
 
 class NoWhitespaceException extends ValidationException
diff --git a/library/Exceptions/NonOmissibleExceptionInterface.php b/library/Exceptions/NonOmissibleExceptionInterface.php
index 94e9270b..8f228e4b 100644
--- a/library/Exceptions/NonOmissibleExceptionInterface.php
+++ b/library/Exceptions/NonOmissibleExceptionInterface.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions;
 
 interface NonOmissibleExceptionInterface extends ExceptionInterface
diff --git a/library/Exceptions/NoneOfException.php b/library/Exceptions/NoneOfException.php
index 244f111f..7ec9de21 100644
--- a/library/Exceptions/NoneOfException.php
+++ b/library/Exceptions/NoneOfException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions;
 
 class NoneOfException extends NestedValidationException
diff --git a/library/Exceptions/NotBlankException.php b/library/Exceptions/NotBlankException.php
index 66b57223..6e35e8ce 100644
--- a/library/Exceptions/NotBlankException.php
+++ b/library/Exceptions/NotBlankException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions;
 
 class NotBlankException extends ValidationException
@@ -29,6 +31,6 @@ class NotBlankException extends ValidationException
 
     public function chooseTemplate()
     {
-        return $this->getName() == '' ? static::STANDARD : static::NAMED;
+        return '' == $this->getName() ? static::STANDARD : static::NAMED;
     }
 }
diff --git a/library/Exceptions/NotEmptyException.php b/library/Exceptions/NotEmptyException.php
index 7414280e..d2f28e8a 100644
--- a/library/Exceptions/NotEmptyException.php
+++ b/library/Exceptions/NotEmptyException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions;
 
 class NotEmptyException extends ValidationException
@@ -28,6 +30,6 @@ class NotEmptyException extends ValidationException
 
     public function chooseTemplate()
     {
-        return $this->getName() == '' ? static::STANDARD : static::NAMED;
+        return '' == $this->getName() ? static::STANDARD : static::NAMED;
     }
 }
diff --git a/library/Exceptions/NotException.php b/library/Exceptions/NotException.php
index e3bc28ae..7f3b3659 100644
--- a/library/Exceptions/NotException.php
+++ b/library/Exceptions/NotException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions;
 
 class NotException extends GroupedValidationException
diff --git a/library/Exceptions/NotOptionalException.php b/library/Exceptions/NotOptionalException.php
index e4b613bf..d4c9e5f7 100644
--- a/library/Exceptions/NotOptionalException.php
+++ b/library/Exceptions/NotOptionalException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions;
 
 class NotOptionalException extends ValidationException
@@ -29,6 +31,6 @@ class NotOptionalException extends ValidationException
 
     public function chooseTemplate()
     {
-        return $this->getName() == '' ? static::STANDARD : static::NAMED;
+        return '' == $this->getName() ? static::STANDARD : static::NAMED;
     }
 }
diff --git a/library/Exceptions/NullTypeException.php b/library/Exceptions/NullTypeException.php
index f5d69efb..5c28050b 100644
--- a/library/Exceptions/NullTypeException.php
+++ b/library/Exceptions/NullTypeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions;
 
 class NullTypeException extends ValidationException
diff --git a/library/Exceptions/NumberException.php b/library/Exceptions/NumberException.php
index 3dbe255a..ad26b48f 100644
--- a/library/Exceptions/NumberException.php
+++ b/library/Exceptions/NumberException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions;
 
 class NumberException extends ValidationException
diff --git a/library/Exceptions/NumericValException.php b/library/Exceptions/NumericValException.php
index 26518e77..d365baf4 100644
--- a/library/Exceptions/NumericValException.php
+++ b/library/Exceptions/NumericValException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions;
 
 class NumericValException extends ValidationException
diff --git a/library/Exceptions/ObjectTypeException.php b/library/Exceptions/ObjectTypeException.php
index f6dd6b94..e99701c8 100644
--- a/library/Exceptions/ObjectTypeException.php
+++ b/library/Exceptions/ObjectTypeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions;
 
 class ObjectTypeException extends ValidationException
diff --git a/library/Exceptions/OddException.php b/library/Exceptions/OddException.php
index 87a0c572..8b01b35f 100644
--- a/library/Exceptions/OddException.php
+++ b/library/Exceptions/OddException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions;
 
 class OddException extends ValidationException
diff --git a/library/Exceptions/OneOfException.php b/library/Exceptions/OneOfException.php
index c28c11b1..5134842f 100644
--- a/library/Exceptions/OneOfException.php
+++ b/library/Exceptions/OneOfException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions;
 
 /**
diff --git a/library/Exceptions/OptionalException.php b/library/Exceptions/OptionalException.php
index f52d5795..e782206c 100644
--- a/library/Exceptions/OptionalException.php
+++ b/library/Exceptions/OptionalException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions;
 
 class OptionalException extends ValidationException
@@ -29,6 +31,6 @@ class OptionalException extends ValidationException
 
     public function chooseTemplate()
     {
-        return $this->getName() == '' ? static::STANDARD : static::NAMED;
+        return '' == $this->getName() ? static::STANDARD : static::NAMED;
     }
 }
diff --git a/library/Exceptions/PerfectSquareException.php b/library/Exceptions/PerfectSquareException.php
index 27f3ae9f..7008845b 100644
--- a/library/Exceptions/PerfectSquareException.php
+++ b/library/Exceptions/PerfectSquareException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions;
 
 class PerfectSquareException extends ValidationException
diff --git a/library/Exceptions/PeselException.php b/library/Exceptions/PeselException.php
index c565402d..1f48f42e 100644
--- a/library/Exceptions/PeselException.php
+++ b/library/Exceptions/PeselException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions;
 
 class PeselException extends ValidationException
diff --git a/library/Exceptions/PhoneException.php b/library/Exceptions/PhoneException.php
index f680684a..5f6c053f 100644
--- a/library/Exceptions/PhoneException.php
+++ b/library/Exceptions/PhoneException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions;
 
 class PhoneException extends ValidationException
diff --git a/library/Exceptions/PhpLabelException.php b/library/Exceptions/PhpLabelException.php
index df76ed56..a63ed65e 100644
--- a/library/Exceptions/PhpLabelException.php
+++ b/library/Exceptions/PhpLabelException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions;
 
 class PhpLabelException extends ValidationException
diff --git a/library/Exceptions/PisException.php b/library/Exceptions/PisException.php
index 7cd14a0a..b1e3e2cb 100644
--- a/library/Exceptions/PisException.php
+++ b/library/Exceptions/PisException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions;
 
 class PisException extends ValidationException
diff --git a/library/Exceptions/PositiveException.php b/library/Exceptions/PositiveException.php
index c370216c..203cfb2d 100644
--- a/library/Exceptions/PositiveException.php
+++ b/library/Exceptions/PositiveException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions;
 
 class PositiveException extends ValidationException
diff --git a/library/Exceptions/PostalCodeException.php b/library/Exceptions/PostalCodeException.php
index 3eaf14ce..16f9e938 100644
--- a/library/Exceptions/PostalCodeException.php
+++ b/library/Exceptions/PostalCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions;
 
 class PostalCodeException extends ValidationException
diff --git a/library/Exceptions/PrimeNumberException.php b/library/Exceptions/PrimeNumberException.php
index 5c4fdf96..b2ba33df 100644
--- a/library/Exceptions/PrimeNumberException.php
+++ b/library/Exceptions/PrimeNumberException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions;
 
 class PrimeNumberException extends ValidationException
diff --git a/library/Exceptions/PrntException.php b/library/Exceptions/PrntException.php
index 79531511..1c2eedb7 100644
--- a/library/Exceptions/PrntException.php
+++ b/library/Exceptions/PrntException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions;
 
 class PrntException extends AlphaException
diff --git a/library/Exceptions/PunctException.php b/library/Exceptions/PunctException.php
index 36948d60..85773210 100644
--- a/library/Exceptions/PunctException.php
+++ b/library/Exceptions/PunctException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions;
 
 class PunctException extends AlphaException
diff --git a/library/Exceptions/ReadableException.php b/library/Exceptions/ReadableException.php
index 9965e2a6..a05eb158 100644
--- a/library/Exceptions/ReadableException.php
+++ b/library/Exceptions/ReadableException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions;
 
 class ReadableException extends ValidationException
diff --git a/library/Exceptions/RecursiveExceptionIterator.php b/library/Exceptions/RecursiveExceptionIterator.php
index 66e6248d..a5149145 100644
--- a/library/Exceptions/RecursiveExceptionIterator.php
+++ b/library/Exceptions/RecursiveExceptionIterator.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions;
 
 use Countable;
@@ -52,12 +54,12 @@ class RecursiveExceptionIterator implements RecursiveIterator, Countable
         return $this->exceptions->key();
     }
 
-    public function next()
+    public function next(): void
     {
         $this->exceptions->next();
     }
 
-    public function rewind()
+    public function rewind(): void
     {
         $this->exceptions->rewind();
     }
diff --git a/library/Exceptions/RegexException.php b/library/Exceptions/RegexException.php
index 76a629bb..e7374f8b 100644
--- a/library/Exceptions/RegexException.php
+++ b/library/Exceptions/RegexException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions;
 
 class RegexException extends ValidationException
diff --git a/library/Exceptions/ResourceTypeException.php b/library/Exceptions/ResourceTypeException.php
index a1f05572..ff3a2789 100644
--- a/library/Exceptions/ResourceTypeException.php
+++ b/library/Exceptions/ResourceTypeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions;
 
 /**
diff --git a/library/Exceptions/RomanException.php b/library/Exceptions/RomanException.php
index 937730d9..9b4b18ad 100644
--- a/library/Exceptions/RomanException.php
+++ b/library/Exceptions/RomanException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions;
 
 class RomanException extends ValidationException
diff --git a/library/Exceptions/ScalarValException.php b/library/Exceptions/ScalarValException.php
index 8744f32c..e8d48e83 100644
--- a/library/Exceptions/ScalarValException.php
+++ b/library/Exceptions/ScalarValException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions;
 
 /**
diff --git a/library/Exceptions/SfException.php b/library/Exceptions/SfException.php
index 76fa3856..97d51689 100644
--- a/library/Exceptions/SfException.php
+++ b/library/Exceptions/SfException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions;
 
 class SfException extends ValidationException
diff --git a/library/Exceptions/SizeException.php b/library/Exceptions/SizeException.php
index 5074bbde..9b796356 100644
--- a/library/Exceptions/SizeException.php
+++ b/library/Exceptions/SizeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions;
 
 /**
diff --git a/library/Exceptions/SlugException.php b/library/Exceptions/SlugException.php
index c2604359..b4c2f051 100644
--- a/library/Exceptions/SlugException.php
+++ b/library/Exceptions/SlugException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions;
 
 class SlugException extends ValidationException
diff --git a/library/Exceptions/SortedException.php b/library/Exceptions/SortedException.php
index eb090f5a..cd515121 100644
--- a/library/Exceptions/SortedException.php
+++ b/library/Exceptions/SortedException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions;
 
 class SortedException extends ValidationException
diff --git a/library/Exceptions/SpaceException.php b/library/Exceptions/SpaceException.php
index f2474228..e9b9601f 100644
--- a/library/Exceptions/SpaceException.php
+++ b/library/Exceptions/SpaceException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions;
 
 class SpaceException extends AlphaException
diff --git a/library/Exceptions/StartsWithException.php b/library/Exceptions/StartsWithException.php
index b0fb95e8..29d4daae 100644
--- a/library/Exceptions/StartsWithException.php
+++ b/library/Exceptions/StartsWithException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions;
 
 class StartsWithException extends ValidationException
diff --git a/library/Exceptions/StringTypeException.php b/library/Exceptions/StringTypeException.php
index 8b2840bc..e9294c35 100644
--- a/library/Exceptions/StringTypeException.php
+++ b/library/Exceptions/StringTypeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions;
 
 class StringTypeException extends ValidationException
diff --git a/library/Exceptions/StringValException.php b/library/Exceptions/StringValException.php
index 1f194b6c..a5de295d 100644
--- a/library/Exceptions/StringValException.php
+++ b/library/Exceptions/StringValException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions;
 
 class StringValException extends ValidationException
diff --git a/library/Exceptions/SubdivisionCode/AdSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/AdSubdivisionCodeException.php
index e1186b73..fa405683 100644
--- a/library/Exceptions/SubdivisionCode/AdSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/AdSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/AeSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/AeSubdivisionCodeException.php
index 2cfd928f..122b0890 100644
--- a/library/Exceptions/SubdivisionCode/AeSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/AeSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/AfSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/AfSubdivisionCodeException.php
index c01b375e..8bd7c1f6 100644
--- a/library/Exceptions/SubdivisionCode/AfSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/AfSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/AgSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/AgSubdivisionCodeException.php
index 2d84419c..60cc0fe9 100644
--- a/library/Exceptions/SubdivisionCode/AgSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/AgSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/AiSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/AiSubdivisionCodeException.php
index 1855f171..a69f1604 100644
--- a/library/Exceptions/SubdivisionCode/AiSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/AiSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/AlSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/AlSubdivisionCodeException.php
index 0361e51e..157ccc22 100644
--- a/library/Exceptions/SubdivisionCode/AlSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/AlSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/AmSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/AmSubdivisionCodeException.php
index 9c9afc0b..cd46c01f 100644
--- a/library/Exceptions/SubdivisionCode/AmSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/AmSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/AnSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/AnSubdivisionCodeException.php
index f3bc25aa..b1161284 100644
--- a/library/Exceptions/SubdivisionCode/AnSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/AnSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/AoSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/AoSubdivisionCodeException.php
index 6e54ae1e..6fae4001 100644
--- a/library/Exceptions/SubdivisionCode/AoSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/AoSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/AqSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/AqSubdivisionCodeException.php
index 8fc38343..047ec659 100644
--- a/library/Exceptions/SubdivisionCode/AqSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/AqSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/ArSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/ArSubdivisionCodeException.php
index 52a7a1fd..7e375c28 100644
--- a/library/Exceptions/SubdivisionCode/ArSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/ArSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/AsSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/AsSubdivisionCodeException.php
index 9eb3c1af..5be39f47 100644
--- a/library/Exceptions/SubdivisionCode/AsSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/AsSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/AtSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/AtSubdivisionCodeException.php
index c6b5c726..101278a1 100644
--- a/library/Exceptions/SubdivisionCode/AtSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/AtSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/AuSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/AuSubdivisionCodeException.php
index b982179b..4fc53727 100644
--- a/library/Exceptions/SubdivisionCode/AuSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/AuSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/AwSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/AwSubdivisionCodeException.php
index 2cc31b81..1dc26318 100644
--- a/library/Exceptions/SubdivisionCode/AwSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/AwSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/AxSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/AxSubdivisionCodeException.php
index 2ac81d2b..6b3bd04b 100644
--- a/library/Exceptions/SubdivisionCode/AxSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/AxSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/AzSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/AzSubdivisionCodeException.php
index 22e29d2f..8074a32d 100644
--- a/library/Exceptions/SubdivisionCode/AzSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/AzSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/BaSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/BaSubdivisionCodeException.php
index fdd7fe87..2fe6e2d5 100644
--- a/library/Exceptions/SubdivisionCode/BaSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/BaSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/BbSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/BbSubdivisionCodeException.php
index 8eb8ba36..7ba9141a 100644
--- a/library/Exceptions/SubdivisionCode/BbSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/BbSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/BdSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/BdSubdivisionCodeException.php
index 8df36c2f..f1f54c89 100644
--- a/library/Exceptions/SubdivisionCode/BdSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/BdSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/BeSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/BeSubdivisionCodeException.php
index 83073aff..1b0760c4 100644
--- a/library/Exceptions/SubdivisionCode/BeSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/BeSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/BfSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/BfSubdivisionCodeException.php
index 09cf11ca..d3580c45 100644
--- a/library/Exceptions/SubdivisionCode/BfSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/BfSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/BgSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/BgSubdivisionCodeException.php
index 48123759..ca885c4a 100644
--- a/library/Exceptions/SubdivisionCode/BgSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/BgSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/BhSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/BhSubdivisionCodeException.php
index 67a7fd39..02baea0b 100644
--- a/library/Exceptions/SubdivisionCode/BhSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/BhSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/BiSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/BiSubdivisionCodeException.php
index 946a26dc..795e6efa 100644
--- a/library/Exceptions/SubdivisionCode/BiSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/BiSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/BjSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/BjSubdivisionCodeException.php
index a4893a7e..f053d8ba 100644
--- a/library/Exceptions/SubdivisionCode/BjSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/BjSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/BlSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/BlSubdivisionCodeException.php
index 8c246f5a..d72c976b 100644
--- a/library/Exceptions/SubdivisionCode/BlSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/BlSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/BmSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/BmSubdivisionCodeException.php
index 9d114bd3..ec6e8e8d 100644
--- a/library/Exceptions/SubdivisionCode/BmSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/BmSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/BnSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/BnSubdivisionCodeException.php
index ff5b171b..8f9bc353 100644
--- a/library/Exceptions/SubdivisionCode/BnSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/BnSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/BoSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/BoSubdivisionCodeException.php
index 1e9afcfa..1106e046 100644
--- a/library/Exceptions/SubdivisionCode/BoSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/BoSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/BqSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/BqSubdivisionCodeException.php
index 27d5b80f..217f7174 100644
--- a/library/Exceptions/SubdivisionCode/BqSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/BqSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/BrSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/BrSubdivisionCodeException.php
index dc78b3e1..12066d1e 100644
--- a/library/Exceptions/SubdivisionCode/BrSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/BrSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/BsSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/BsSubdivisionCodeException.php
index 1d508a09..1aaa351f 100644
--- a/library/Exceptions/SubdivisionCode/BsSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/BsSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/BtSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/BtSubdivisionCodeException.php
index 06826b16..4d96c551 100644
--- a/library/Exceptions/SubdivisionCode/BtSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/BtSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/BvSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/BvSubdivisionCodeException.php
index 9cdb9546..6df7cda6 100644
--- a/library/Exceptions/SubdivisionCode/BvSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/BvSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/BwSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/BwSubdivisionCodeException.php
index 4aaaa22a..9e7987e5 100644
--- a/library/Exceptions/SubdivisionCode/BwSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/BwSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/BySubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/BySubdivisionCodeException.php
index 1537996b..d9604ac0 100644
--- a/library/Exceptions/SubdivisionCode/BySubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/BySubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/BzSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/BzSubdivisionCodeException.php
index 360e1d94..f8fffe2b 100644
--- a/library/Exceptions/SubdivisionCode/BzSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/BzSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/CaSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/CaSubdivisionCodeException.php
index d9673a5a..49416930 100644
--- a/library/Exceptions/SubdivisionCode/CaSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/CaSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/CcSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/CcSubdivisionCodeException.php
index 000db2d7..71a1b449 100644
--- a/library/Exceptions/SubdivisionCode/CcSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/CcSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/CdSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/CdSubdivisionCodeException.php
index 67a0613b..31c59c5d 100644
--- a/library/Exceptions/SubdivisionCode/CdSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/CdSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/CfSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/CfSubdivisionCodeException.php
index 67172ef3..875a4000 100644
--- a/library/Exceptions/SubdivisionCode/CfSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/CfSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/CgSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/CgSubdivisionCodeException.php
index 6984d462..9e313001 100644
--- a/library/Exceptions/SubdivisionCode/CgSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/CgSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/ChSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/ChSubdivisionCodeException.php
index f6aedf69..efbf191e 100644
--- a/library/Exceptions/SubdivisionCode/ChSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/ChSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/CiSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/CiSubdivisionCodeException.php
index 4299f83e..3d6938e7 100644
--- a/library/Exceptions/SubdivisionCode/CiSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/CiSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/CkSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/CkSubdivisionCodeException.php
index 7325d83d..170464a1 100644
--- a/library/Exceptions/SubdivisionCode/CkSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/CkSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/ClSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/ClSubdivisionCodeException.php
index ccbd691d..fc78325a 100644
--- a/library/Exceptions/SubdivisionCode/ClSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/ClSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/CmSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/CmSubdivisionCodeException.php
index e0f5d5a4..c317abed 100644
--- a/library/Exceptions/SubdivisionCode/CmSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/CmSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/CnSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/CnSubdivisionCodeException.php
index c1c92748..8442c7e3 100644
--- a/library/Exceptions/SubdivisionCode/CnSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/CnSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/CoSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/CoSubdivisionCodeException.php
index 7f99b3a7..de996307 100644
--- a/library/Exceptions/SubdivisionCode/CoSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/CoSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/CrSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/CrSubdivisionCodeException.php
index e5abddec..37208d15 100644
--- a/library/Exceptions/SubdivisionCode/CrSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/CrSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/CsSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/CsSubdivisionCodeException.php
index 10fe81ce..3db28edc 100644
--- a/library/Exceptions/SubdivisionCode/CsSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/CsSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/CuSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/CuSubdivisionCodeException.php
index 618c905e..87176db2 100644
--- a/library/Exceptions/SubdivisionCode/CuSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/CuSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/CvSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/CvSubdivisionCodeException.php
index 99141bd8..a05f6b5b 100644
--- a/library/Exceptions/SubdivisionCode/CvSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/CvSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/CwSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/CwSubdivisionCodeException.php
index 8c28435a..18ddb1d6 100644
--- a/library/Exceptions/SubdivisionCode/CwSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/CwSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/CxSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/CxSubdivisionCodeException.php
index a2a95b31..fe98e96e 100644
--- a/library/Exceptions/SubdivisionCode/CxSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/CxSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/CySubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/CySubdivisionCodeException.php
index a1b1da96..113f2afb 100644
--- a/library/Exceptions/SubdivisionCode/CySubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/CySubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/CzSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/CzSubdivisionCodeException.php
index b6f84405..a01d19c6 100644
--- a/library/Exceptions/SubdivisionCode/CzSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/CzSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/DeSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/DeSubdivisionCodeException.php
index 4f07751c..963dee0f 100644
--- a/library/Exceptions/SubdivisionCode/DeSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/DeSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/DjSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/DjSubdivisionCodeException.php
index a41df22c..0358d509 100644
--- a/library/Exceptions/SubdivisionCode/DjSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/DjSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/DkSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/DkSubdivisionCodeException.php
index cef6f3ca..b011da47 100644
--- a/library/Exceptions/SubdivisionCode/DkSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/DkSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/DmSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/DmSubdivisionCodeException.php
index eef71571..0440a5fa 100644
--- a/library/Exceptions/SubdivisionCode/DmSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/DmSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/DoSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/DoSubdivisionCodeException.php
index 93562299..bb5bd5dc 100644
--- a/library/Exceptions/SubdivisionCode/DoSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/DoSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/DzSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/DzSubdivisionCodeException.php
index 1d4d0075..ecf4ee76 100644
--- a/library/Exceptions/SubdivisionCode/DzSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/DzSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/EcSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/EcSubdivisionCodeException.php
index 4815a16e..275ec2a9 100644
--- a/library/Exceptions/SubdivisionCode/EcSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/EcSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/EeSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/EeSubdivisionCodeException.php
index 8309a594..1bd56da6 100644
--- a/library/Exceptions/SubdivisionCode/EeSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/EeSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/EgSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/EgSubdivisionCodeException.php
index 3c55a7ca..7e7fa8bf 100644
--- a/library/Exceptions/SubdivisionCode/EgSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/EgSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/EhSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/EhSubdivisionCodeException.php
index 533c4440..3754aecd 100644
--- a/library/Exceptions/SubdivisionCode/EhSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/EhSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/ErSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/ErSubdivisionCodeException.php
index b162128b..d6f18ce7 100644
--- a/library/Exceptions/SubdivisionCode/ErSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/ErSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/EsSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/EsSubdivisionCodeException.php
index 7a476e39..6881e3a6 100644
--- a/library/Exceptions/SubdivisionCode/EsSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/EsSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/EtSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/EtSubdivisionCodeException.php
index 83be03cb..9c2204bb 100644
--- a/library/Exceptions/SubdivisionCode/EtSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/EtSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/FiSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/FiSubdivisionCodeException.php
index c6908084..61366769 100644
--- a/library/Exceptions/SubdivisionCode/FiSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/FiSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/FjSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/FjSubdivisionCodeException.php
index 3f0419e7..4fc64a2c 100644
--- a/library/Exceptions/SubdivisionCode/FjSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/FjSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/FkSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/FkSubdivisionCodeException.php
index 77e40f09..99baae14 100644
--- a/library/Exceptions/SubdivisionCode/FkSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/FkSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/FmSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/FmSubdivisionCodeException.php
index ffa1083c..7cdd8c4b 100644
--- a/library/Exceptions/SubdivisionCode/FmSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/FmSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/FoSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/FoSubdivisionCodeException.php
index 911d30d2..0a324f68 100644
--- a/library/Exceptions/SubdivisionCode/FoSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/FoSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/FrSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/FrSubdivisionCodeException.php
index c489dfa1..ab3ad391 100644
--- a/library/Exceptions/SubdivisionCode/FrSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/FrSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/GaSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/GaSubdivisionCodeException.php
index 610731db..455f9983 100644
--- a/library/Exceptions/SubdivisionCode/GaSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/GaSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/GbSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/GbSubdivisionCodeException.php
index 1c5afea1..2a6b7abb 100644
--- a/library/Exceptions/SubdivisionCode/GbSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/GbSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/GdSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/GdSubdivisionCodeException.php
index 5a20caaa..34874e60 100644
--- a/library/Exceptions/SubdivisionCode/GdSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/GdSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/GeSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/GeSubdivisionCodeException.php
index 93735e5d..86d55e1e 100644
--- a/library/Exceptions/SubdivisionCode/GeSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/GeSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/GfSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/GfSubdivisionCodeException.php
index 18fe33bd..989b8a48 100644
--- a/library/Exceptions/SubdivisionCode/GfSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/GfSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/GgSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/GgSubdivisionCodeException.php
index 7d679a50..e16de71e 100644
--- a/library/Exceptions/SubdivisionCode/GgSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/GgSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/GhSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/GhSubdivisionCodeException.php
index 35b0eb5c..53d18591 100644
--- a/library/Exceptions/SubdivisionCode/GhSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/GhSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/GiSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/GiSubdivisionCodeException.php
index 8118b89c..e4064c83 100644
--- a/library/Exceptions/SubdivisionCode/GiSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/GiSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/GlSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/GlSubdivisionCodeException.php
index a2782f08..526c70b0 100644
--- a/library/Exceptions/SubdivisionCode/GlSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/GlSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/GmSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/GmSubdivisionCodeException.php
index c7027934..83d3a4e4 100644
--- a/library/Exceptions/SubdivisionCode/GmSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/GmSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/GnSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/GnSubdivisionCodeException.php
index ba3a75fd..253eedf1 100644
--- a/library/Exceptions/SubdivisionCode/GnSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/GnSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/GpSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/GpSubdivisionCodeException.php
index f1a23c15..13a97345 100644
--- a/library/Exceptions/SubdivisionCode/GpSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/GpSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/GqSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/GqSubdivisionCodeException.php
index c499922f..207806f7 100644
--- a/library/Exceptions/SubdivisionCode/GqSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/GqSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/GrSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/GrSubdivisionCodeException.php
index 8bac708c..f4327b50 100644
--- a/library/Exceptions/SubdivisionCode/GrSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/GrSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/GsSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/GsSubdivisionCodeException.php
index 3841cec8..d489aa3f 100644
--- a/library/Exceptions/SubdivisionCode/GsSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/GsSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/GtSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/GtSubdivisionCodeException.php
index 932e1885..4996b014 100644
--- a/library/Exceptions/SubdivisionCode/GtSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/GtSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/GuSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/GuSubdivisionCodeException.php
index a10200cb..f184e6ad 100644
--- a/library/Exceptions/SubdivisionCode/GuSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/GuSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/GwSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/GwSubdivisionCodeException.php
index 1263c99a..5b74afa3 100644
--- a/library/Exceptions/SubdivisionCode/GwSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/GwSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/GySubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/GySubdivisionCodeException.php
index 0a9109c9..72187f0d 100644
--- a/library/Exceptions/SubdivisionCode/GySubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/GySubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/HkSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/HkSubdivisionCodeException.php
index b75e3a8c..a0e59022 100644
--- a/library/Exceptions/SubdivisionCode/HkSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/HkSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/HmSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/HmSubdivisionCodeException.php
index b587407a..bf65d337 100644
--- a/library/Exceptions/SubdivisionCode/HmSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/HmSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/HnSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/HnSubdivisionCodeException.php
index 24a0a088..85d78033 100644
--- a/library/Exceptions/SubdivisionCode/HnSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/HnSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/HrSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/HrSubdivisionCodeException.php
index df2070c8..8c64d60b 100644
--- a/library/Exceptions/SubdivisionCode/HrSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/HrSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/HtSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/HtSubdivisionCodeException.php
index e627b2b0..8e2f53c1 100644
--- a/library/Exceptions/SubdivisionCode/HtSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/HtSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/HuSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/HuSubdivisionCodeException.php
index 8dc112b9..ec1a82e4 100644
--- a/library/Exceptions/SubdivisionCode/HuSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/HuSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/IdSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/IdSubdivisionCodeException.php
index dc354588..418bd396 100644
--- a/library/Exceptions/SubdivisionCode/IdSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/IdSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/IeSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/IeSubdivisionCodeException.php
index 2ca8407f..5d908c39 100644
--- a/library/Exceptions/SubdivisionCode/IeSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/IeSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/IlSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/IlSubdivisionCodeException.php
index bf40b447..2da4ccd1 100644
--- a/library/Exceptions/SubdivisionCode/IlSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/IlSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/ImSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/ImSubdivisionCodeException.php
index f992adc0..80eb1813 100644
--- a/library/Exceptions/SubdivisionCode/ImSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/ImSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/InSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/InSubdivisionCodeException.php
index 635950d1..72d62116 100644
--- a/library/Exceptions/SubdivisionCode/InSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/InSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/IoSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/IoSubdivisionCodeException.php
index 6c5f34e3..793807c8 100644
--- a/library/Exceptions/SubdivisionCode/IoSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/IoSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/IqSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/IqSubdivisionCodeException.php
index f683729e..95a86f6c 100644
--- a/library/Exceptions/SubdivisionCode/IqSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/IqSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/IrSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/IrSubdivisionCodeException.php
index a25a6c13..f43f8f56 100644
--- a/library/Exceptions/SubdivisionCode/IrSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/IrSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/IsSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/IsSubdivisionCodeException.php
index 16649899..00c3566e 100644
--- a/library/Exceptions/SubdivisionCode/IsSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/IsSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/ItSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/ItSubdivisionCodeException.php
index 09d010bf..64400a54 100644
--- a/library/Exceptions/SubdivisionCode/ItSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/ItSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/JeSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/JeSubdivisionCodeException.php
index 92a549f9..95a07ce7 100644
--- a/library/Exceptions/SubdivisionCode/JeSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/JeSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/JmSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/JmSubdivisionCodeException.php
index fe2812ee..95ed1a98 100644
--- a/library/Exceptions/SubdivisionCode/JmSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/JmSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/JoSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/JoSubdivisionCodeException.php
index eeb995c9..5b572661 100644
--- a/library/Exceptions/SubdivisionCode/JoSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/JoSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/JpSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/JpSubdivisionCodeException.php
index 6d6b3bec..240532d3 100644
--- a/library/Exceptions/SubdivisionCode/JpSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/JpSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/KeSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/KeSubdivisionCodeException.php
index 367c3df3..0b40aea5 100644
--- a/library/Exceptions/SubdivisionCode/KeSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/KeSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/KgSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/KgSubdivisionCodeException.php
index af06b336..b58727eb 100644
--- a/library/Exceptions/SubdivisionCode/KgSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/KgSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/KhSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/KhSubdivisionCodeException.php
index 566fa01f..9ea03c5a 100644
--- a/library/Exceptions/SubdivisionCode/KhSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/KhSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/KiSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/KiSubdivisionCodeException.php
index c2c73fac..57aeadac 100644
--- a/library/Exceptions/SubdivisionCode/KiSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/KiSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/KmSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/KmSubdivisionCodeException.php
index 4adfe228..572e5b28 100644
--- a/library/Exceptions/SubdivisionCode/KmSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/KmSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/KnSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/KnSubdivisionCodeException.php
index 8e14fbe4..8fc799e5 100644
--- a/library/Exceptions/SubdivisionCode/KnSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/KnSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/KpSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/KpSubdivisionCodeException.php
index 19016e8b..2f53538b 100644
--- a/library/Exceptions/SubdivisionCode/KpSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/KpSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/KrSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/KrSubdivisionCodeException.php
index 2bf28c56..6063a7f5 100644
--- a/library/Exceptions/SubdivisionCode/KrSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/KrSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/KwSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/KwSubdivisionCodeException.php
index 3fcad03f..6e6dfd9f 100644
--- a/library/Exceptions/SubdivisionCode/KwSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/KwSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/KySubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/KySubdivisionCodeException.php
index 5c232151..7d5afd88 100644
--- a/library/Exceptions/SubdivisionCode/KySubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/KySubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/KzSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/KzSubdivisionCodeException.php
index a2c28634..3cbd7359 100644
--- a/library/Exceptions/SubdivisionCode/KzSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/KzSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/LaSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/LaSubdivisionCodeException.php
index 4ed937e0..41ef6cd7 100644
--- a/library/Exceptions/SubdivisionCode/LaSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/LaSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/LbSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/LbSubdivisionCodeException.php
index 803fc26b..a35f3d86 100644
--- a/library/Exceptions/SubdivisionCode/LbSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/LbSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/LcSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/LcSubdivisionCodeException.php
index c9087630..f8ff15c8 100644
--- a/library/Exceptions/SubdivisionCode/LcSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/LcSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/LiSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/LiSubdivisionCodeException.php
index be3da21a..8ef51858 100644
--- a/library/Exceptions/SubdivisionCode/LiSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/LiSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/LkSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/LkSubdivisionCodeException.php
index 587a98e1..d1627310 100644
--- a/library/Exceptions/SubdivisionCode/LkSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/LkSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/LrSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/LrSubdivisionCodeException.php
index 0e571cac..a29893f4 100644
--- a/library/Exceptions/SubdivisionCode/LrSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/LrSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/LsSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/LsSubdivisionCodeException.php
index b7b2c4f4..55bcd369 100644
--- a/library/Exceptions/SubdivisionCode/LsSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/LsSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/LtSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/LtSubdivisionCodeException.php
index aa62d6f7..63629054 100644
--- a/library/Exceptions/SubdivisionCode/LtSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/LtSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/LuSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/LuSubdivisionCodeException.php
index 5aafbe35..6eef25a1 100644
--- a/library/Exceptions/SubdivisionCode/LuSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/LuSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/LvSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/LvSubdivisionCodeException.php
index c3658054..fe02e1b5 100644
--- a/library/Exceptions/SubdivisionCode/LvSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/LvSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/LySubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/LySubdivisionCodeException.php
index 93661c33..086abdba 100644
--- a/library/Exceptions/SubdivisionCode/LySubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/LySubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/MaSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/MaSubdivisionCodeException.php
index 1b27fe26..b42bdd5c 100644
--- a/library/Exceptions/SubdivisionCode/MaSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/MaSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/McSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/McSubdivisionCodeException.php
index 26535da2..c80d4037 100644
--- a/library/Exceptions/SubdivisionCode/McSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/McSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/MdSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/MdSubdivisionCodeException.php
index 47efbe3f..3141a248 100644
--- a/library/Exceptions/SubdivisionCode/MdSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/MdSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/MeSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/MeSubdivisionCodeException.php
index 69e382fb..d276de7f 100644
--- a/library/Exceptions/SubdivisionCode/MeSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/MeSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/MfSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/MfSubdivisionCodeException.php
index 81bec5fb..244ca59d 100644
--- a/library/Exceptions/SubdivisionCode/MfSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/MfSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/MgSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/MgSubdivisionCodeException.php
index 92038f46..d712fbda 100644
--- a/library/Exceptions/SubdivisionCode/MgSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/MgSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/MhSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/MhSubdivisionCodeException.php
index c3a6048b..967498df 100644
--- a/library/Exceptions/SubdivisionCode/MhSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/MhSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/MkSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/MkSubdivisionCodeException.php
index 6aecab8a..dad85295 100644
--- a/library/Exceptions/SubdivisionCode/MkSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/MkSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/MlSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/MlSubdivisionCodeException.php
index 7df2606b..b35283ac 100644
--- a/library/Exceptions/SubdivisionCode/MlSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/MlSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/MmSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/MmSubdivisionCodeException.php
index 4fbb9b8f..6a058e5f 100644
--- a/library/Exceptions/SubdivisionCode/MmSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/MmSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/MnSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/MnSubdivisionCodeException.php
index 19a59d93..df9b46e3 100644
--- a/library/Exceptions/SubdivisionCode/MnSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/MnSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/MoSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/MoSubdivisionCodeException.php
index d4fddd52..d86f17ae 100644
--- a/library/Exceptions/SubdivisionCode/MoSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/MoSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/MpSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/MpSubdivisionCodeException.php
index 1b6c11e4..ac65b605 100644
--- a/library/Exceptions/SubdivisionCode/MpSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/MpSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/MqSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/MqSubdivisionCodeException.php
index 94c5d9a9..4b28daab 100644
--- a/library/Exceptions/SubdivisionCode/MqSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/MqSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/MrSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/MrSubdivisionCodeException.php
index fc683dd9..9a2e9389 100644
--- a/library/Exceptions/SubdivisionCode/MrSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/MrSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/MsSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/MsSubdivisionCodeException.php
index 298d52a3..84fc3676 100644
--- a/library/Exceptions/SubdivisionCode/MsSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/MsSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/MtSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/MtSubdivisionCodeException.php
index 1c9cbfef..8422e372 100644
--- a/library/Exceptions/SubdivisionCode/MtSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/MtSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/MuSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/MuSubdivisionCodeException.php
index ad424d47..f254d492 100644
--- a/library/Exceptions/SubdivisionCode/MuSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/MuSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/MvSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/MvSubdivisionCodeException.php
index 647dc7a6..83fe165d 100644
--- a/library/Exceptions/SubdivisionCode/MvSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/MvSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/MwSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/MwSubdivisionCodeException.php
index c845f1a5..a2380084 100644
--- a/library/Exceptions/SubdivisionCode/MwSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/MwSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/MxSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/MxSubdivisionCodeException.php
index ada122d5..d6b1bfc8 100644
--- a/library/Exceptions/SubdivisionCode/MxSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/MxSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/MySubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/MySubdivisionCodeException.php
index 82200b58..69e1fe57 100644
--- a/library/Exceptions/SubdivisionCode/MySubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/MySubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/MzSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/MzSubdivisionCodeException.php
index 0ddfa1ac..bd9e4295 100644
--- a/library/Exceptions/SubdivisionCode/MzSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/MzSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/NaSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/NaSubdivisionCodeException.php
index 917bd808..0aa5a3f1 100644
--- a/library/Exceptions/SubdivisionCode/NaSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/NaSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/NcSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/NcSubdivisionCodeException.php
index c1420768..2d71cb01 100644
--- a/library/Exceptions/SubdivisionCode/NcSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/NcSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/NeSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/NeSubdivisionCodeException.php
index d2aa93f6..e8ba8c74 100644
--- a/library/Exceptions/SubdivisionCode/NeSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/NeSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/NfSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/NfSubdivisionCodeException.php
index c54a5347..a77ea683 100644
--- a/library/Exceptions/SubdivisionCode/NfSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/NfSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/NgSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/NgSubdivisionCodeException.php
index 2fb4bac3..fcb46647 100644
--- a/library/Exceptions/SubdivisionCode/NgSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/NgSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/NiSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/NiSubdivisionCodeException.php
index 1a890021..fa9c8ae8 100644
--- a/library/Exceptions/SubdivisionCode/NiSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/NiSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/NlSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/NlSubdivisionCodeException.php
index 658080a8..6800b790 100644
--- a/library/Exceptions/SubdivisionCode/NlSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/NlSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/NoSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/NoSubdivisionCodeException.php
index 348d5ff7..c35ff4f6 100644
--- a/library/Exceptions/SubdivisionCode/NoSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/NoSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/NpSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/NpSubdivisionCodeException.php
index 87df7a45..acbe9228 100644
--- a/library/Exceptions/SubdivisionCode/NpSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/NpSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/NrSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/NrSubdivisionCodeException.php
index e7beea16..20398d0d 100644
--- a/library/Exceptions/SubdivisionCode/NrSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/NrSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/NuSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/NuSubdivisionCodeException.php
index f3dfe1ca..bc6041af 100644
--- a/library/Exceptions/SubdivisionCode/NuSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/NuSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/NzSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/NzSubdivisionCodeException.php
index d2efc66f..fdf90ab8 100644
--- a/library/Exceptions/SubdivisionCode/NzSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/NzSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/OmSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/OmSubdivisionCodeException.php
index 95582588..70828bc5 100644
--- a/library/Exceptions/SubdivisionCode/OmSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/OmSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/PaSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/PaSubdivisionCodeException.php
index fc7e9568..f57db09e 100644
--- a/library/Exceptions/SubdivisionCode/PaSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/PaSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/PeSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/PeSubdivisionCodeException.php
index bf878bfb..7da9dfce 100644
--- a/library/Exceptions/SubdivisionCode/PeSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/PeSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/PfSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/PfSubdivisionCodeException.php
index b2cf036c..aee94010 100644
--- a/library/Exceptions/SubdivisionCode/PfSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/PfSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/PgSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/PgSubdivisionCodeException.php
index 76881a35..50c1986e 100644
--- a/library/Exceptions/SubdivisionCode/PgSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/PgSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/PhSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/PhSubdivisionCodeException.php
index 2b9c6e8f..c4e51bb2 100644
--- a/library/Exceptions/SubdivisionCode/PhSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/PhSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/PkSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/PkSubdivisionCodeException.php
index 2c90a49b..935031e3 100644
--- a/library/Exceptions/SubdivisionCode/PkSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/PkSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/PlSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/PlSubdivisionCodeException.php
index 32e20334..3a054702 100644
--- a/library/Exceptions/SubdivisionCode/PlSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/PlSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/PmSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/PmSubdivisionCodeException.php
index f0d2f1a0..2dd14934 100644
--- a/library/Exceptions/SubdivisionCode/PmSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/PmSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/PnSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/PnSubdivisionCodeException.php
index 6f015f72..a3112193 100644
--- a/library/Exceptions/SubdivisionCode/PnSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/PnSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/PrSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/PrSubdivisionCodeException.php
index 453cb5b6..b43ae834 100644
--- a/library/Exceptions/SubdivisionCode/PrSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/PrSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/PsSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/PsSubdivisionCodeException.php
index 49504cea..12353a90 100644
--- a/library/Exceptions/SubdivisionCode/PsSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/PsSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/PtSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/PtSubdivisionCodeException.php
index e1e84cb9..f8cca9f5 100644
--- a/library/Exceptions/SubdivisionCode/PtSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/PtSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/PwSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/PwSubdivisionCodeException.php
index 060542d1..ef7eff42 100644
--- a/library/Exceptions/SubdivisionCode/PwSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/PwSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/PySubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/PySubdivisionCodeException.php
index 3309c1c5..541336e3 100644
--- a/library/Exceptions/SubdivisionCode/PySubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/PySubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/QaSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/QaSubdivisionCodeException.php
index 3d99d18d..c7de8c1c 100644
--- a/library/Exceptions/SubdivisionCode/QaSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/QaSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/ReSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/ReSubdivisionCodeException.php
index ffaa2888..22053ee0 100644
--- a/library/Exceptions/SubdivisionCode/ReSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/ReSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/RoSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/RoSubdivisionCodeException.php
index 27a808db..40fa2765 100644
--- a/library/Exceptions/SubdivisionCode/RoSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/RoSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/RsSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/RsSubdivisionCodeException.php
index 1d6e2edd..e4c5b19b 100644
--- a/library/Exceptions/SubdivisionCode/RsSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/RsSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/RuSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/RuSubdivisionCodeException.php
index 98012603..f6bd8828 100644
--- a/library/Exceptions/SubdivisionCode/RuSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/RuSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/RwSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/RwSubdivisionCodeException.php
index 927efa24..0eba3c4b 100644
--- a/library/Exceptions/SubdivisionCode/RwSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/RwSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/SaSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/SaSubdivisionCodeException.php
index 26135275..89fdb90f 100644
--- a/library/Exceptions/SubdivisionCode/SaSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/SaSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/SbSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/SbSubdivisionCodeException.php
index 89f01f09..e2cdcda9 100644
--- a/library/Exceptions/SubdivisionCode/SbSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/SbSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/ScSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/ScSubdivisionCodeException.php
index c616e7a0..329faccd 100644
--- a/library/Exceptions/SubdivisionCode/ScSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/ScSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/SdSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/SdSubdivisionCodeException.php
index 74a78f69..d40f1c5c 100644
--- a/library/Exceptions/SubdivisionCode/SdSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/SdSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/SeSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/SeSubdivisionCodeException.php
index cc247f5d..0493a23d 100644
--- a/library/Exceptions/SubdivisionCode/SeSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/SeSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/SgSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/SgSubdivisionCodeException.php
index b73b5cd0..9776a43e 100644
--- a/library/Exceptions/SubdivisionCode/SgSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/SgSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/ShSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/ShSubdivisionCodeException.php
index 84a031b9..98804ba3 100644
--- a/library/Exceptions/SubdivisionCode/ShSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/ShSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/SiSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/SiSubdivisionCodeException.php
index 9369b234..5695dd32 100644
--- a/library/Exceptions/SubdivisionCode/SiSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/SiSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/SjSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/SjSubdivisionCodeException.php
index b782c8fb..ff4af904 100644
--- a/library/Exceptions/SubdivisionCode/SjSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/SjSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/SkSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/SkSubdivisionCodeException.php
index aa7f1bdb..f17209ed 100644
--- a/library/Exceptions/SubdivisionCode/SkSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/SkSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/SlSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/SlSubdivisionCodeException.php
index 2279d3a0..b6a17e86 100644
--- a/library/Exceptions/SubdivisionCode/SlSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/SlSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/SmSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/SmSubdivisionCodeException.php
index ac781665..467160ab 100644
--- a/library/Exceptions/SubdivisionCode/SmSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/SmSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/SnSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/SnSubdivisionCodeException.php
index 99f6d9f6..fa8fd0b5 100644
--- a/library/Exceptions/SubdivisionCode/SnSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/SnSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/SoSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/SoSubdivisionCodeException.php
index 0c9f955c..715759ec 100644
--- a/library/Exceptions/SubdivisionCode/SoSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/SoSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/SrSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/SrSubdivisionCodeException.php
index e3de12fc..a1566fdf 100644
--- a/library/Exceptions/SubdivisionCode/SrSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/SrSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/SsSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/SsSubdivisionCodeException.php
index ca6d34dc..dc31f220 100644
--- a/library/Exceptions/SubdivisionCode/SsSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/SsSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/StSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/StSubdivisionCodeException.php
index 2e8c30b0..0d8ccfed 100644
--- a/library/Exceptions/SubdivisionCode/StSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/StSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/SvSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/SvSubdivisionCodeException.php
index c38aa515..7ffe301c 100644
--- a/library/Exceptions/SubdivisionCode/SvSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/SvSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/SxSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/SxSubdivisionCodeException.php
index 02c14ed5..3b96bbc6 100644
--- a/library/Exceptions/SubdivisionCode/SxSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/SxSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/SySubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/SySubdivisionCodeException.php
index 3e0bd22d..c3805d36 100644
--- a/library/Exceptions/SubdivisionCode/SySubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/SySubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/SzSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/SzSubdivisionCodeException.php
index 805af1fb..dcf77473 100644
--- a/library/Exceptions/SubdivisionCode/SzSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/SzSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/TcSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/TcSubdivisionCodeException.php
index 1fec56df..edd9fb55 100644
--- a/library/Exceptions/SubdivisionCode/TcSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/TcSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/TdSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/TdSubdivisionCodeException.php
index a3851dfc..77e8b7ba 100644
--- a/library/Exceptions/SubdivisionCode/TdSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/TdSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/TfSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/TfSubdivisionCodeException.php
index 03c4c940..e82bff13 100644
--- a/library/Exceptions/SubdivisionCode/TfSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/TfSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/TgSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/TgSubdivisionCodeException.php
index 52d1b9b3..27658e0d 100644
--- a/library/Exceptions/SubdivisionCode/TgSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/TgSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/ThSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/ThSubdivisionCodeException.php
index 5569bd7d..609a5ef3 100644
--- a/library/Exceptions/SubdivisionCode/ThSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/ThSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/TjSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/TjSubdivisionCodeException.php
index 6e2a2828..04e3869c 100644
--- a/library/Exceptions/SubdivisionCode/TjSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/TjSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/TkSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/TkSubdivisionCodeException.php
index 92e04cdf..eb1e95cd 100644
--- a/library/Exceptions/SubdivisionCode/TkSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/TkSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/TlSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/TlSubdivisionCodeException.php
index 42900e75..a9cdabfd 100644
--- a/library/Exceptions/SubdivisionCode/TlSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/TlSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/TmSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/TmSubdivisionCodeException.php
index 7103929a..1e3c0bbb 100644
--- a/library/Exceptions/SubdivisionCode/TmSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/TmSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/TnSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/TnSubdivisionCodeException.php
index f6104f34..515c398d 100644
--- a/library/Exceptions/SubdivisionCode/TnSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/TnSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/ToSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/ToSubdivisionCodeException.php
index b9e21725..164ee8e5 100644
--- a/library/Exceptions/SubdivisionCode/ToSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/ToSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/TrSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/TrSubdivisionCodeException.php
index df1475c7..455513d4 100644
--- a/library/Exceptions/SubdivisionCode/TrSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/TrSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/TtSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/TtSubdivisionCodeException.php
index 369eede3..ebb8e518 100644
--- a/library/Exceptions/SubdivisionCode/TtSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/TtSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/TvSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/TvSubdivisionCodeException.php
index a9cdccf7..8df624e0 100644
--- a/library/Exceptions/SubdivisionCode/TvSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/TvSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/TwSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/TwSubdivisionCodeException.php
index d0bca773..391c95dc 100644
--- a/library/Exceptions/SubdivisionCode/TwSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/TwSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/TzSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/TzSubdivisionCodeException.php
index 503ce5fb..0b31b777 100644
--- a/library/Exceptions/SubdivisionCode/TzSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/TzSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/UaSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/UaSubdivisionCodeException.php
index 2bfb562b..187fab48 100644
--- a/library/Exceptions/SubdivisionCode/UaSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/UaSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/UgSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/UgSubdivisionCodeException.php
index 11cfe253..65b90877 100644
--- a/library/Exceptions/SubdivisionCode/UgSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/UgSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/UmSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/UmSubdivisionCodeException.php
index d9a044b6..b85a0999 100644
--- a/library/Exceptions/SubdivisionCode/UmSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/UmSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/UsSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/UsSubdivisionCodeException.php
index 4bde83e5..99e2185d 100644
--- a/library/Exceptions/SubdivisionCode/UsSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/UsSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/UySubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/UySubdivisionCodeException.php
index 77f4b6a2..2053a76d 100644
--- a/library/Exceptions/SubdivisionCode/UySubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/UySubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/UzSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/UzSubdivisionCodeException.php
index 40fa852d..0c8b4025 100644
--- a/library/Exceptions/SubdivisionCode/UzSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/UzSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/VaSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/VaSubdivisionCodeException.php
index 6c3e5f85..6c0af6c3 100644
--- a/library/Exceptions/SubdivisionCode/VaSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/VaSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/VcSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/VcSubdivisionCodeException.php
index e31582a7..0fd93303 100644
--- a/library/Exceptions/SubdivisionCode/VcSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/VcSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/VeSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/VeSubdivisionCodeException.php
index d907712a..3aa9528a 100644
--- a/library/Exceptions/SubdivisionCode/VeSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/VeSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/VgSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/VgSubdivisionCodeException.php
index ef5b9c7d..6fd49488 100644
--- a/library/Exceptions/SubdivisionCode/VgSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/VgSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/ViSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/ViSubdivisionCodeException.php
index f6e9464e..48b60a06 100644
--- a/library/Exceptions/SubdivisionCode/ViSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/ViSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/VnSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/VnSubdivisionCodeException.php
index 3562311e..1b1bb6c1 100644
--- a/library/Exceptions/SubdivisionCode/VnSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/VnSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/VuSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/VuSubdivisionCodeException.php
index bb7e6382..47514d2a 100644
--- a/library/Exceptions/SubdivisionCode/VuSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/VuSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/WfSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/WfSubdivisionCodeException.php
index 27ae0498..c49648b9 100644
--- a/library/Exceptions/SubdivisionCode/WfSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/WfSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/WsSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/WsSubdivisionCodeException.php
index a6baa11a..fda3ca89 100644
--- a/library/Exceptions/SubdivisionCode/WsSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/WsSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/XkSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/XkSubdivisionCodeException.php
index 4e99d595..be08e8cf 100644
--- a/library/Exceptions/SubdivisionCode/XkSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/XkSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/YeSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/YeSubdivisionCodeException.php
index bcc53447..54837c89 100644
--- a/library/Exceptions/SubdivisionCode/YeSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/YeSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/YtSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/YtSubdivisionCodeException.php
index c97cc01b..8e36e45e 100644
--- a/library/Exceptions/SubdivisionCode/YtSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/YtSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/ZaSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/ZaSubdivisionCodeException.php
index 5ac6b32e..c5e4e497 100644
--- a/library/Exceptions/SubdivisionCode/ZaSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/ZaSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/ZmSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/ZmSubdivisionCodeException.php
index 56a16e3e..864055a8 100644
--- a/library/Exceptions/SubdivisionCode/ZmSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/ZmSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCode/ZwSubdivisionCodeException.php b/library/Exceptions/SubdivisionCode/ZwSubdivisionCodeException.php
index d8ce6c94..63855b8d 100644
--- a/library/Exceptions/SubdivisionCode/ZwSubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCode/ZwSubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions\SubdivisionCode;
 
 use Respect\Validation\Exceptions\SubdivisionCodeException;
diff --git a/library/Exceptions/SubdivisionCodeException.php b/library/Exceptions/SubdivisionCodeException.php
index e78a9b81..fe9ae085 100644
--- a/library/Exceptions/SubdivisionCodeException.php
+++ b/library/Exceptions/SubdivisionCodeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions;
 
 class SubdivisionCodeException extends ValidationException
diff --git a/library/Exceptions/SymbolicLinkException.php b/library/Exceptions/SymbolicLinkException.php
index 6b92db13..d15a88e6 100644
--- a/library/Exceptions/SymbolicLinkException.php
+++ b/library/Exceptions/SymbolicLinkException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions;
 
 class SymbolicLinkException extends ValidationException
diff --git a/library/Exceptions/TldException.php b/library/Exceptions/TldException.php
index 6d525cd6..3d52f87b 100644
--- a/library/Exceptions/TldException.php
+++ b/library/Exceptions/TldException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions;
 
 class TldException extends ValidationException
diff --git a/library/Exceptions/TrueValException.php b/library/Exceptions/TrueValException.php
index c4bd88f1..d247dcd9 100644
--- a/library/Exceptions/TrueValException.php
+++ b/library/Exceptions/TrueValException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions;
 
 class TrueValException extends ValidationException
diff --git a/library/Exceptions/TypeException.php b/library/Exceptions/TypeException.php
index 2023faf3..cf422411 100644
--- a/library/Exceptions/TypeException.php
+++ b/library/Exceptions/TypeException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions;
 
 class TypeException extends ValidationException
diff --git a/library/Exceptions/UniqueException.php b/library/Exceptions/UniqueException.php
index 87fc5c8c..291c8cca 100644
--- a/library/Exceptions/UniqueException.php
+++ b/library/Exceptions/UniqueException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions;
 
 class UniqueException extends ValidationException
diff --git a/library/Exceptions/UploadedException.php b/library/Exceptions/UploadedException.php
index 37b1483c..687b4d5c 100644
--- a/library/Exceptions/UploadedException.php
+++ b/library/Exceptions/UploadedException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions;
 
 class UploadedException extends ValidationException
diff --git a/library/Exceptions/UppercaseException.php b/library/Exceptions/UppercaseException.php
index 67d3753a..b1bcddda 100644
--- a/library/Exceptions/UppercaseException.php
+++ b/library/Exceptions/UppercaseException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions;
 
 class UppercaseException extends ValidationException
diff --git a/library/Exceptions/UrlException.php b/library/Exceptions/UrlException.php
index b6dca86c..871c01f6 100644
--- a/library/Exceptions/UrlException.php
+++ b/library/Exceptions/UrlException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions;
 
 class UrlException extends ValidationException
diff --git a/library/Exceptions/UuidException.php b/library/Exceptions/UuidException.php
index 76df04a8..f9911b02 100644
--- a/library/Exceptions/UuidException.php
+++ b/library/Exceptions/UuidException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions;
 
 class UuidException extends ValidationException
diff --git a/library/Exceptions/ValidationException.php b/library/Exceptions/ValidationException.php
index e6744084..7ecc7653 100644
--- a/library/Exceptions/ValidationException.php
+++ b/library/Exceptions/ValidationException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions;
 
 use DateTime;
@@ -315,7 +317,7 @@ class ValidationException extends InvalidArgumentException implements ExceptionI
         return $this;
     }
 
-    private function buildMessage()
+    private function buildMessage(): void
     {
         $this->message = $this->getMainMessage();
     }
@@ -329,7 +331,7 @@ class ValidationException extends InvalidArgumentException implements ExceptionI
 
     public function guessId()
     {
-        if (!empty($this->id) && $this->id != 'validation') {
+        if (!empty($this->id) && 'validation' != $this->id) {
             return $this->id;
         }
 
diff --git a/library/Exceptions/VatinException.php b/library/Exceptions/VatinException.php
index 56a916a2..0b907993 100644
--- a/library/Exceptions/VatinException.php
+++ b/library/Exceptions/VatinException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions;
 
 final class VatinException extends ValidationException
diff --git a/library/Exceptions/VersionException.php b/library/Exceptions/VersionException.php
index ae1f4a3f..deba6b98 100644
--- a/library/Exceptions/VersionException.php
+++ b/library/Exceptions/VersionException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions;
 
 class VersionException extends ValidationException
diff --git a/library/Exceptions/VideoUrlException.php b/library/Exceptions/VideoUrlException.php
index 3486bc96..c2bef43b 100644
--- a/library/Exceptions/VideoUrlException.php
+++ b/library/Exceptions/VideoUrlException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions;
 
 class VideoUrlException extends ValidationException
diff --git a/library/Exceptions/VowelException.php b/library/Exceptions/VowelException.php
index 5e8428f9..54256127 100644
--- a/library/Exceptions/VowelException.php
+++ b/library/Exceptions/VowelException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions;
 
 class VowelException extends AlphaException
diff --git a/library/Exceptions/WhenException.php b/library/Exceptions/WhenException.php
index 68137c72..6e987d0a 100644
--- a/library/Exceptions/WhenException.php
+++ b/library/Exceptions/WhenException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions;
 
 class WhenException extends ValidationException
diff --git a/library/Exceptions/WritableException.php b/library/Exceptions/WritableException.php
index 3e90531b..d26b6478 100644
--- a/library/Exceptions/WritableException.php
+++ b/library/Exceptions/WritableException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions;
 
 class WritableException extends ValidationException
diff --git a/library/Exceptions/XdigitException.php b/library/Exceptions/XdigitException.php
index d240f9ee..33c92190 100644
--- a/library/Exceptions/XdigitException.php
+++ b/library/Exceptions/XdigitException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions;
 
 class XdigitException extends AlphaException
diff --git a/library/Exceptions/YesException.php b/library/Exceptions/YesException.php
index 1dc6c1fd..03356f88 100644
--- a/library/Exceptions/YesException.php
+++ b/library/Exceptions/YesException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions;
 
 class YesException extends ValidationException
diff --git a/library/Exceptions/ZendException.php b/library/Exceptions/ZendException.php
index 3fcffcac..6d422b8c 100644
--- a/library/Exceptions/ZendException.php
+++ b/library/Exceptions/ZendException.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions;
 
 class ZendException extends NestedValidationException
diff --git a/library/Factory.php b/library/Factory.php
index 354acb73..e73b85b9 100644
--- a/library/Factory.php
+++ b/library/Factory.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation;
 
 use ReflectionClass;
@@ -31,12 +33,12 @@ class Factory
         return $rulePrefix.$namespaceSeparator;
     }
 
-    public function appendRulePrefix($rulePrefix)
+    public function appendRulePrefix($rulePrefix): void
     {
         array_push($this->rulePrefixes, $this->filterRulePrefix($rulePrefix));
     }
 
-    public function prependRulePrefix($rulePrefix)
+    public function prependRulePrefix($rulePrefix): void
     {
         array_unshift($this->rulePrefixes, $this->filterRulePrefix($rulePrefix));
     }
diff --git a/library/Rules/AbstractComposite.php b/library/Rules/AbstractComposite.php
index ada77523..85c46605 100644
--- a/library/Rules/AbstractComposite.php
+++ b/library/Rules/AbstractComposite.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 use Respect\Validation\Exceptions\ValidationException;
@@ -50,7 +52,7 @@ abstract class AbstractComposite extends AbstractRule
         return $this;
     }
 
-    public function removeRules()
+    public function removeRules(): void
     {
         $this->rules = [];
     }
@@ -98,7 +100,7 @@ abstract class AbstractComposite extends AbstractRule
         return false;
     }
 
-    protected function appendRule(Validatable $validator)
+    protected function appendRule(Validatable $validator): void
     {
         if (!$validator->getName() && $this->getName()) {
             $validator->setName($this->getName());
diff --git a/library/Rules/AbstractCtypeRule.php b/library/Rules/AbstractCtypeRule.php
index 9ef3fd5a..0cc745f7 100644
--- a/library/Rules/AbstractCtypeRule.php
+++ b/library/Rules/AbstractCtypeRule.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 abstract class AbstractCtypeRule extends AbstractFilterRule
diff --git a/library/Rules/AbstractFilterRule.php b/library/Rules/AbstractFilterRule.php
index 3a5c21d4..9c9c6ff5 100644
--- a/library/Rules/AbstractFilterRule.php
+++ b/library/Rules/AbstractFilterRule.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 use Respect\Validation\Exceptions\ComponentException;
@@ -46,6 +48,6 @@ abstract class AbstractFilterRule extends AbstractRule
 
         $cleanInput = $this->filter($stringInput);
 
-        return $cleanInput === '' || $this->validateClean($cleanInput);
+        return '' === $cleanInput || $this->validateClean($cleanInput);
     }
 }
diff --git a/library/Rules/AbstractInterval.php b/library/Rules/AbstractInterval.php
index c6c7e07c..48cc814b 100644
--- a/library/Rules/AbstractInterval.php
+++ b/library/Rules/AbstractInterval.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 use DateTimeImmutable;
@@ -31,7 +33,7 @@ abstract class AbstractInterval extends AbstractRule
             return $value;
         }
 
-        if (mb_strlen($value) == 1) {
+        if (1 == mb_strlen($value)) {
             return $value;
         }
 
diff --git a/library/Rules/AbstractRegexRule.php b/library/Rules/AbstractRegexRule.php
index 31e4e4c8..b44422ce 100644
--- a/library/Rules/AbstractRegexRule.php
+++ b/library/Rules/AbstractRegexRule.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 abstract class AbstractRegexRule extends AbstractFilterRule
diff --git a/library/Rules/AbstractRelated.php b/library/Rules/AbstractRelated.php
index 4cebb77f..d335fb9c 100644
--- a/library/Rules/AbstractRelated.php
+++ b/library/Rules/AbstractRelated.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 use Respect\Validation\Exceptions\ValidationException;
diff --git a/library/Rules/AbstractRule.php b/library/Rules/AbstractRule.php
index 5e8b3463..b8dbcb3e 100644
--- a/library/Rules/AbstractRule.php
+++ b/library/Rules/AbstractRule.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 use Respect\Validation\Exceptions\ValidationException;
diff --git a/library/Rules/AbstractSearcher.php b/library/Rules/AbstractSearcher.php
index 4fa4a017..f1892198 100644
--- a/library/Rules/AbstractSearcher.php
+++ b/library/Rules/AbstractSearcher.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 abstract class AbstractSearcher extends AbstractRule
@@ -22,11 +24,13 @@ abstract class AbstractSearcher extends AbstractRule
             return in_array($input, $this->haystack);
         }
 
-        if ($input === null || $input === '') {
+        if (null === $input || '' === $input) {
             return $input == $this->haystack;
         }
 
-        return false !== mb_stripos($this->haystack, $input, 0, mb_detect_encoding($input));
+        $inputString = (string) $input;
+
+        return false !== mb_stripos($this->haystack, $inputString, 0, mb_detect_encoding($inputString));
     }
 
     protected function validateIdentical($input)
@@ -35,11 +39,13 @@ abstract class AbstractSearcher extends AbstractRule
             return in_array($input, $this->haystack, true);
         }
 
-        if ($input === null || $input === '') {
+        if (null === $input || '' === $input) {
             return $input === $this->haystack;
         }
 
-        return false !== mb_strpos($this->haystack, $input, 0, mb_detect_encoding($input));
+        $inputString = (string) $input;
+
+        return false !== mb_strpos($this->haystack, $inputString, 0, mb_detect_encoding($inputString));
     }
 
     public function validate($input)
diff --git a/library/Rules/AbstractWrapper.php b/library/Rules/AbstractWrapper.php
index 1ca0110b..35cf5ea5 100644
--- a/library/Rules/AbstractWrapper.php
+++ b/library/Rules/AbstractWrapper.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 use Respect\Validation\Exceptions\ComponentException;
diff --git a/library/Rules/Age.php b/library/Rules/Age.php
index 4d286886..bbfb2793 100644
--- a/library/Rules/Age.php
+++ b/library/Rules/Age.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 use DateTime as DateTimeMutable;
@@ -40,7 +42,7 @@ class Age extends AllOf
         return new DateTimeMutable($interval);
     }
 
-    private function setMaxAge($maxAge)
+    private function setMaxAge($maxAge): void
     {
         $this->maxAge = $maxAge;
 
@@ -56,7 +58,7 @@ class Age extends AllOf
         $this->addRule($minRule);
     }
 
-    private function setMinAge($minAge)
+    private function setMinAge($minAge): void
     {
         $this->minAge = $minAge;
 
diff --git a/library/Rules/AllOf.php b/library/Rules/AllOf.php
index 30d5656c..e255d72d 100644
--- a/library/Rules/AllOf.php
+++ b/library/Rules/AllOf.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 class AllOf extends AbstractComposite
diff --git a/library/Rules/Alnum.php b/library/Rules/Alnum.php
index 22a8e589..cc6bfd79 100644
--- a/library/Rules/Alnum.php
+++ b/library/Rules/Alnum.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 class Alnum extends AbstractCtypeRule
diff --git a/library/Rules/Alpha.php b/library/Rules/Alpha.php
index 105ae721..daa113fb 100644
--- a/library/Rules/Alpha.php
+++ b/library/Rules/Alpha.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 class Alpha extends AbstractCtypeRule
diff --git a/library/Rules/AlwaysInvalid.php b/library/Rules/AlwaysInvalid.php
index 6e6ad885..4ed645b9 100644
--- a/library/Rules/AlwaysInvalid.php
+++ b/library/Rules/AlwaysInvalid.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 class AlwaysInvalid extends AbstractRule
diff --git a/library/Rules/AlwaysValid.php b/library/Rules/AlwaysValid.php
index bf33806b..fa9889c9 100644
--- a/library/Rules/AlwaysValid.php
+++ b/library/Rules/AlwaysValid.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 class AlwaysValid extends AbstractRule
diff --git a/library/Rules/AnyOf.php b/library/Rules/AnyOf.php
index a20ca422..927a8674 100644
--- a/library/Rules/AnyOf.php
+++ b/library/Rules/AnyOf.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 use Respect\Validation\Exceptions\ValidationException;
diff --git a/library/Rules/ArrayType.php b/library/Rules/ArrayType.php
index 6afbd1ba..92ecf443 100644
--- a/library/Rules/ArrayType.php
+++ b/library/Rules/ArrayType.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 class ArrayType extends AbstractRule
diff --git a/library/Rules/ArrayVal.php b/library/Rules/ArrayVal.php
index 142fedf8..56ff5bf1 100644
--- a/library/Rules/ArrayVal.php
+++ b/library/Rules/ArrayVal.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 use ArrayAccess;
diff --git a/library/Rules/Attribute.php b/library/Rules/Attribute.php
index b066461b..2d0be054 100644
--- a/library/Rules/Attribute.php
+++ b/library/Rules/Attribute.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 use ReflectionProperty;
diff --git a/library/Rules/Base.php b/library/Rules/Base.php
index 21f79757..d67824ab 100644
--- a/library/Rules/Base.php
+++ b/library/Rules/Base.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 use Respect\Validation\Exceptions\BaseException;
diff --git a/library/Rules/Base64.php b/library/Rules/Base64.php
index ec7cf893..72791123 100644
--- a/library/Rules/Base64.php
+++ b/library/Rules/Base64.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 class Base64 extends AbstractRule
@@ -23,6 +25,6 @@ class Base64 extends AbstractRule
             return false;
         }
 
-        return strlen($input) % 4 === 0;
+        return 0 === mb_strlen($input) % 4;
     }
 }
diff --git a/library/Rules/Between.php b/library/Rules/Between.php
index 0d92adb1..d833af97 100644
--- a/library/Rules/Between.php
+++ b/library/Rules/Between.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 use Respect\Validation\Exceptions\ComponentException;
diff --git a/library/Rules/BoolType.php b/library/Rules/BoolType.php
index 3005bd51..3aa803ca 100644
--- a/library/Rules/BoolType.php
+++ b/library/Rules/BoolType.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 class BoolType extends AbstractRule
diff --git a/library/Rules/BoolVal.php b/library/Rules/BoolVal.php
index 234b88ac..f47379bb 100644
--- a/library/Rules/BoolVal.php
+++ b/library/Rules/BoolVal.php
@@ -1,4 +1,5 @@
 <?php
+
 /*
  * This file is part of Respect/Validation.
  *
@@ -8,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 class BoolVal extends AbstractRule
diff --git a/library/Rules/Bsn.php b/library/Rules/Bsn.php
index d7a8b247..20b9ae14 100644
--- a/library/Rules/Bsn.php
+++ b/library/Rules/Bsn.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 /**
@@ -29,7 +31,7 @@ class Bsn extends AbstractRule
             return false;
         }
 
-        if (mb_strlen($input) !== 9) {
+        if (9 !== mb_strlen($input)) {
             return false;
         }
 
@@ -38,6 +40,6 @@ class Bsn extends AbstractRule
             $sum += $i * $input[9 - $i];
         }
 
-        return $sum !== 0 && $sum % 11 === 0;
+        return 0 !== $sum && 0 === $sum % 11;
     }
 }
diff --git a/library/Rules/Call.php b/library/Rules/Call.php
index b62dcca8..28d13d39 100644
--- a/library/Rules/Call.php
+++ b/library/Rules/Call.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 class Call extends AbstractRelated
diff --git a/library/Rules/CallableType.php b/library/Rules/CallableType.php
index 223ee03e..b38da2b1 100644
--- a/library/Rules/CallableType.php
+++ b/library/Rules/CallableType.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 /**
diff --git a/library/Rules/Callback.php b/library/Rules/Callback.php
index af906d11..f72c777b 100644
--- a/library/Rules/Callback.php
+++ b/library/Rules/Callback.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 use Respect\Validation\Exceptions\ComponentException;
diff --git a/library/Rules/Charset.php b/library/Rules/Charset.php
index bd82ec47..bc9512da 100644
--- a/library/Rules/Charset.php
+++ b/library/Rules/Charset.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 use Respect\Validation\Exceptions\ComponentException;
diff --git a/library/Rules/Cnh.php b/library/Rules/Cnh.php
index 36840d76..42d076d4 100644
--- a/library/Rules/Cnh.php
+++ b/library/Rules/Cnh.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 class Cnh extends AbstractRule
@@ -23,7 +25,7 @@ class Cnh extends AbstractRule
         $input = preg_replace('{\D}', '', (string) $input);
 
         // Validate length and invalid numbers
-        if ((mb_strlen($input) != 11) || (intval($input) == 0)) {
+        if ((11 != mb_strlen($input)) || (0 == intval($input))) {
             return false;
         }
 
diff --git a/library/Rules/Cnpj.php b/library/Rules/Cnpj.php
index 0d1bb214..c4081e2c 100644
--- a/library/Rules/Cnpj.php
+++ b/library/Rules/Cnpj.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 class Cnpj extends AbstractRule
@@ -27,7 +29,7 @@ class Cnpj extends AbstractRule
             return false;
         }
 
-        if (mb_strlen($cleanInput) != 14) {
+        if (14 != mb_strlen($cleanInput)) {
             return false;
         }
 
diff --git a/library/Rules/Cntrl.php b/library/Rules/Cntrl.php
index fdb1c9bb..facb209a 100644
--- a/library/Rules/Cntrl.php
+++ b/library/Rules/Cntrl.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 class Cntrl extends AbstractCtypeRule
diff --git a/library/Rules/Consonant.php b/library/Rules/Consonant.php
index 14da6fc9..ca167923 100644
--- a/library/Rules/Consonant.php
+++ b/library/Rules/Consonant.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 class Consonant extends AbstractRegexRule
diff --git a/library/Rules/Contains.php b/library/Rules/Contains.php
index 26499c5d..4fcef2f1 100644
--- a/library/Rules/Contains.php
+++ b/library/Rules/Contains.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 class Contains extends AbstractRule
@@ -18,7 +20,7 @@ class Contains extends AbstractRule
 
     public function __construct($containsValue, $identical = false)
     {
-        $this->containsValue = $containsValue;
+        $this->containsValue = (string) $containsValue;
         $this->identical = $identical;
     }
 
@@ -37,7 +39,9 @@ class Contains extends AbstractRule
             return in_array($this->containsValue, $input);
         }
 
-        return false !== mb_stripos($input, $this->containsValue, 0, mb_detect_encoding($input));
+        $inputString = (string) $input;
+
+        return false !== mb_stripos($inputString, $this->containsValue, 0, mb_detect_encoding($inputString));
     }
 
     protected function validateIdentical($input)
@@ -46,6 +50,8 @@ class Contains extends AbstractRule
             return in_array($this->containsValue, $input, true);
         }
 
-        return false !== mb_strpos($input, $this->containsValue, 0, mb_detect_encoding($input));
+        $inputString = (string) $input;
+
+        return false !== mb_strpos($inputString, $this->containsValue, 0, mb_detect_encoding($inputString));
     }
 }
diff --git a/library/Rules/Countable.php b/library/Rules/Countable.php
index a6514c54..219c2f9a 100644
--- a/library/Rules/Countable.php
+++ b/library/Rules/Countable.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 class Countable extends AbstractRule
diff --git a/library/Rules/CountryCode.php b/library/Rules/CountryCode.php
index a4edd986..6d8a5b74 100644
--- a/library/Rules/CountryCode.php
+++ b/library/Rules/CountryCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 use Respect\Validation\Exceptions\ComponentException;
@@ -23,7 +25,7 @@ class CountryCode extends AbstractRule
     const NUMERIC = 'numeric';
 
     /**
-     * @link http://download.geonames.org/export/dump/countryInfo.txt
+     * @see http://download.geonames.org/export/dump/countryInfo.txt
      *
      * @var array
      */
@@ -280,7 +282,6 @@ class CountryCode extends AbstractRule
         ['ZA', 'ZAF', '710'], // South Africa
         ['ZM', 'ZMB', '894'], // Zambia
         ['ZW', 'ZWE', '716'], // Zimbabwe
-
     ];
 
     public $set;
diff --git a/library/Rules/Cpf.php b/library/Rules/Cpf.php
index ad3d2f19..0a31a3e4 100644
--- a/library/Rules/Cpf.php
+++ b/library/Rules/Cpf.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 class Cpf extends AbstractRule
@@ -18,7 +20,7 @@ class Cpf extends AbstractRule
         // Code ported from jsfromhell.com
         $c = preg_replace('/\D/', '', $input);
 
-        if (mb_strlen($c) != 11 || preg_match("/^{$c[0]}{11}$/", $c)) {
+        if (11 != mb_strlen($c) || preg_match("/^{$c[0]}{11}$/", $c)) {
             return false;
         }
 
diff --git a/library/Rules/CreditCard.php b/library/Rules/CreditCard.php
index deb64a1d..6cd28bfc 100644
--- a/library/Rules/CreditCard.php
+++ b/library/Rules/CreditCard.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 use Respect\Validation\Exceptions\ComponentException;
diff --git a/library/Rules/CurrencyCode.php b/library/Rules/CurrencyCode.php
index d92239e8..2948fd7c 100644
--- a/library/Rules/CurrencyCode.php
+++ b/library/Rules/CurrencyCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 /**
@@ -17,7 +19,7 @@ namespace Respect\Validation\Rules;
 class CurrencyCode extends AbstractRule
 {
     /**
-     * @link http://www.currency-iso.org/en/home/tables/table-a1.html
+     * @see http://www.currency-iso.org/en/home/tables/table-a1.html
      *
      * @var array
      */
diff --git a/library/Rules/DateTime.php b/library/Rules/DateTime.php
index 8509e85c..20098fac 100644
--- a/library/Rules/DateTime.php
+++ b/library/Rules/DateTime.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 use DateTimeInterface;
@@ -49,6 +51,6 @@ class DateTime extends AbstractRule
 
         $info = date_parse_from_format($this->format, $inputString);
 
-        return $info['error_count'] === 0 && $info['warning_count'] === 0;
+        return 0 === $info['error_count'] && 0 === $info['warning_count'];
     }
 }
diff --git a/library/Rules/Digit.php b/library/Rules/Digit.php
index 4d21f8e0..0021291c 100644
--- a/library/Rules/Digit.php
+++ b/library/Rules/Digit.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 class Digit extends AbstractCtypeRule
diff --git a/library/Rules/Directory.php b/library/Rules/Directory.php
index e190c803..a4559dae 100644
--- a/library/Rules/Directory.php
+++ b/library/Rules/Directory.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 class Directory extends AbstractRule
diff --git a/library/Rules/Domain.php b/library/Rules/Domain.php
index c4603c9c..23bffd10 100644
--- a/library/Rules/Domain.php
+++ b/library/Rules/Domain.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 use Respect\Validation\Exceptions\ValidationException;
@@ -31,7 +33,7 @@ class Domain extends AbstractComposite
             new AnyOf(
                 new Not(new Contains('--')),
                 new Callback(function ($str) {
-                    return substr_count($str, '--') == 1;
+                    return 1 == mb_substr_count($str, '--');
                 })
             ),
             new Not(new EndsWith('-'))
@@ -40,7 +42,7 @@ class Domain extends AbstractComposite
 
     public function tldCheck($do = true)
     {
-        if ($do === true) {
+        if (true === $do) {
             $this->tld = new Tld();
         } else {
             $this->tld = new AllOf(
@@ -63,7 +65,7 @@ class Domain extends AbstractComposite
             }
         }
 
-        if (count($parts = explode('.', $input)) < 2
+        if (count($parts = explode('.', (string) $input)) < 2
             || !$this->tld->validate(array_pop($parts))) {
             return false;
         }
@@ -84,7 +86,7 @@ class Domain extends AbstractComposite
             $this->collectAssertException($e, $chk, $input);
         }
 
-        if (count($parts = explode('.', $input)) >= 2) {
+        if (count($parts = explode('.', (string) $input)) >= 2) {
             $this->collectAssertException($e, $this->tld, array_pop($parts));
         }
 
@@ -99,7 +101,7 @@ class Domain extends AbstractComposite
         return true;
     }
 
-    protected function collectAssertException(&$exceptions, $validator, $input)
+    protected function collectAssertException(&$exceptions, $validator, $input): void
     {
         try {
             $validator->assert($input);
diff --git a/library/Rules/Each.php b/library/Rules/Each.php
index dc24b31f..bfb15c46 100644
--- a/library/Rules/Each.php
+++ b/library/Rules/Each.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 use Respect\Validation\Exceptions\ValidationException;
diff --git a/library/Rules/Email.php b/library/Rules/Email.php
index 0c0e8700..761434ca 100644
--- a/library/Rules/Email.php
+++ b/library/Rules/Email.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 use Egulias\EmailValidator\EmailValidator;
diff --git a/library/Rules/EndsWith.php b/library/Rules/EndsWith.php
index bae67562..7a1acba2 100644
--- a/library/Rules/EndsWith.php
+++ b/library/Rules/EndsWith.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 class EndsWith extends AbstractRule
diff --git a/library/Rules/Equals.php b/library/Rules/Equals.php
index 9676a9f7..84b7081d 100644
--- a/library/Rules/Equals.php
+++ b/library/Rules/Equals.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 class Equals extends AbstractRule
diff --git a/library/Rules/Even.php b/library/Rules/Even.php
index 6ea51dad..a9e0265a 100644
--- a/library/Rules/Even.php
+++ b/library/Rules/Even.php
@@ -9,12 +9,14 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 class Even extends AbstractRule
 {
     public function validate($input)
     {
-        return (int) $input % 2 === 0;
+        return 0 === (int) $input % 2;
     }
 }
diff --git a/library/Rules/Executable.php b/library/Rules/Executable.php
index 29f1af16..5bd36699 100644
--- a/library/Rules/Executable.php
+++ b/library/Rules/Executable.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 class Executable extends AbstractRule
diff --git a/library/Rules/Exists.php b/library/Rules/Exists.php
index 54b4103a..3e6790e4 100644
--- a/library/Rules/Exists.php
+++ b/library/Rules/Exists.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 class Exists extends AbstractRule
diff --git a/library/Rules/Extension.php b/library/Rules/Extension.php
index 6d416f97..e316c9cc 100644
--- a/library/Rules/Extension.php
+++ b/library/Rules/Extension.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 use SplFileInfo;
diff --git a/library/Rules/Factor.php b/library/Rules/Factor.php
index 1641e053..1b8b2d07 100644
--- a/library/Rules/Factor.php
+++ b/library/Rules/Factor.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 use Respect\Validation\Exceptions\ComponentException;
@@ -35,12 +37,12 @@ class Factor extends AbstractRule
     {
         // Every integer is a factor of zero, and zero is the only integer that
         // has zero for a factor.
-        if ($this->dividend === 0) {
+        if (0 === $this->dividend) {
             return true;
         }
 
         // Factors must be integers that are not zero.
-        if (!is_numeric($input) || (int) $input != $input || $input == 0) {
+        if (!is_numeric($input) || (int) $input != $input || 0 == $input) {
             return false;
         }
 
diff --git a/library/Rules/FalseVal.php b/library/Rules/FalseVal.php
index 684e14b2..af589adb 100644
--- a/library/Rules/FalseVal.php
+++ b/library/Rules/FalseVal.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 class FalseVal extends AbstractRule
diff --git a/library/Rules/Fibonacci.php b/library/Rules/Fibonacci.php
index af13b203..ac1969d4 100644
--- a/library/Rules/Fibonacci.php
+++ b/library/Rules/Fibonacci.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 /**
diff --git a/library/Rules/File.php b/library/Rules/File.php
index 4ef5dac4..ee44394a 100644
--- a/library/Rules/File.php
+++ b/library/Rules/File.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 class File extends AbstractRule
diff --git a/library/Rules/FilterVar.php b/library/Rules/FilterVar.php
index 7122afb1..17a9496e 100644
--- a/library/Rules/FilterVar.php
+++ b/library/Rules/FilterVar.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 use Respect\Validation\Exceptions\ComponentException;
diff --git a/library/Rules/Finite.php b/library/Rules/Finite.php
index ed311088..291308d8 100644
--- a/library/Rules/Finite.php
+++ b/library/Rules/Finite.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 /**
@@ -21,6 +23,6 @@ class Finite extends AbstractRule
      */
     public function validate($input)
     {
-        return is_numeric($input) && is_finite($input);
+        return is_numeric($input) && is_finite((float) $input);
     }
 }
diff --git a/library/Rules/FloatType.php b/library/Rules/FloatType.php
index 69c20146..ac2b5f6f 100644
--- a/library/Rules/FloatType.php
+++ b/library/Rules/FloatType.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 class FloatType extends AbstractRule
diff --git a/library/Rules/FloatVal.php b/library/Rules/FloatVal.php
index 25b08ce7..bb4bb25b 100644
--- a/library/Rules/FloatVal.php
+++ b/library/Rules/FloatVal.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 class FloatVal extends AbstractRule
diff --git a/library/Rules/Graph.php b/library/Rules/Graph.php
index 19759808..8b58b2b1 100644
--- a/library/Rules/Graph.php
+++ b/library/Rules/Graph.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 class Graph extends AbstractCtypeRule
diff --git a/library/Rules/HexRgbColor.php b/library/Rules/HexRgbColor.php
index 658181d2..fe640ea3 100644
--- a/library/Rules/HexRgbColor.php
+++ b/library/Rules/HexRgbColor.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 class HexRgbColor extends Xdigit
@@ -24,7 +26,7 @@ class HexRgbColor extends Xdigit
         }
 
         $length = mb_strlen($input);
-        if ($length != 3 && $length != 6) {
+        if (3 != $length && 6 != $length) {
             return false;
         }
 
diff --git a/library/Rules/Identical.php b/library/Rules/Identical.php
index 32efaba0..72486ab9 100644
--- a/library/Rules/Identical.php
+++ b/library/Rules/Identical.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 class Identical extends AbstractRule
diff --git a/library/Rules/IdentityCard.php b/library/Rules/IdentityCard.php
index 2ebabda7..2b36bbb6 100644
--- a/library/Rules/IdentityCard.php
+++ b/library/Rules/IdentityCard.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 use Respect\Validation\Exceptions\ComponentException;
diff --git a/library/Rules/Image.php b/library/Rules/Image.php
index 36ce7327..507c11d2 100644
--- a/library/Rules/Image.php
+++ b/library/Rules/Image.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 use finfo;
diff --git a/library/Rules/Imei.php b/library/Rules/Imei.php
index 02fba495..893ccf5e 100644
--- a/library/Rules/Imei.php
+++ b/library/Rules/Imei.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 class Imei extends AbstractRule
@@ -29,7 +31,7 @@ class Imei extends AbstractRule
         }
 
         $numbers = preg_replace('/\D/', '', $input);
-        if (mb_strlen($numbers) != self::IMEI_SIZE) {
+        if (self::IMEI_SIZE != mb_strlen($numbers)) {
             return false;
         }
 
diff --git a/library/Rules/In.php b/library/Rules/In.php
index 5bb7c9ec..2c7f6cf4 100644
--- a/library/Rules/In.php
+++ b/library/Rules/In.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 class In extends AbstractSearcher
diff --git a/library/Rules/Infinite.php b/library/Rules/Infinite.php
index 51ee5b0e..c20fa944 100644
--- a/library/Rules/Infinite.php
+++ b/library/Rules/Infinite.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 /**
@@ -21,6 +23,6 @@ class Infinite extends AbstractRule
      */
     public function validate($input)
     {
-        return is_numeric($input) && is_infinite($input);
+        return is_numeric($input) && is_infinite((float) $input);
     }
 }
diff --git a/library/Rules/Instance.php b/library/Rules/Instance.php
index 3eacc712..ab10bdee 100644
--- a/library/Rules/Instance.php
+++ b/library/Rules/Instance.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 class Instance extends AbstractRule
diff --git a/library/Rules/IntType.php b/library/Rules/IntType.php
index 3c8c42d8..41759f39 100644
--- a/library/Rules/IntType.php
+++ b/library/Rules/IntType.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 class IntType extends AbstractRule
diff --git a/library/Rules/IntVal.php b/library/Rules/IntVal.php
index 9da26c1b..ec94c6ec 100644
--- a/library/Rules/IntVal.php
+++ b/library/Rules/IntVal.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 class IntVal extends AbstractRule
diff --git a/library/Rules/Ip.php b/library/Rules/Ip.php
index e43c41f8..384147df 100644
--- a/library/Rules/Ip.php
+++ b/library/Rules/Ip.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 use Respect\Validation\Exceptions\ComponentException;
@@ -32,18 +34,18 @@ class Ip extends AbstractRule
 
     protected function parseRange($input)
     {
-        if ($input === null || $input == '*' || $input == '*.*.*.*'
-            || $input == '0.0.0.0-255.255.255.255') {
+        if (null === $input || '*' == $input || '*.*.*.*' == $input
+            || '0.0.0.0-255.255.255.255' == $input) {
             return;
         }
 
         $range = ['min' => null, 'max' => null, 'mask' => null];
 
-        if (mb_strpos($input, '-') !== false) {
+        if (false !== mb_strpos($input, '-')) {
             list($range['min'], $range['max']) = explode('-', $input);
-        } elseif (mb_strpos($input, '*') !== false) {
+        } elseif (false !== mb_strpos($input, '*')) {
             $this->parseRangeUsingWildcards($input, $range);
-        } elseif (mb_strpos($input, '/') !== false) {
+        } elseif (false !== mb_strpos($input, '/')) {
             $this->parseRangeUsingCidr($input, $range);
         } else {
             throw new ComponentException('Invalid network range');
@@ -60,14 +62,14 @@ class Ip extends AbstractRule
         return $range;
     }
 
-    protected function fillAddress(&$input, $char = '*')
+    protected function fillAddress(&$input, $char = '*'): void
     {
         while (mb_substr_count($input, '.') < 3) {
             $input .= '.'.$char;
         }
     }
 
-    protected function parseRangeUsingWildcards($input, &$range)
+    protected function parseRangeUsingWildcards($input, &$range): void
     {
         $this->fillAddress($input);
 
@@ -75,13 +77,13 @@ class Ip extends AbstractRule
         $range['max'] = str_replace('*', '255', $input);
     }
 
-    protected function parseRangeUsingCidr($input, &$range)
+    protected function parseRangeUsingCidr($input, &$range): void
     {
         $input = explode('/', $input);
         $this->fillAddress($input[0], '0');
 
         $range['min'] = $input[0];
-        $isAddressMask = mb_strpos($input[1], '.') !== false;
+        $isAddressMask = false !== mb_strpos($input[1], '.');
 
         if ($isAddressMask && $this->verifyAddress($input[1])) {
             $range['mask'] = sprintf('%032b', ip2long($input[1]));
@@ -93,7 +95,7 @@ class Ip extends AbstractRule
             throw new ComponentException('Invalid network mask');
         }
 
-        $range['mask'] = sprintf('%032b', ip2long(long2ip(~(pow(2, (32 - $input[1])) - 1))));
+        $range['mask'] = sprintf('%032b', ip2long(long2ip(~(2 ** (32 - $input[1]) - 1))));
     }
 
     public function validate($input)
@@ -114,7 +116,7 @@ class Ip extends AbstractRule
 
     protected function verifyNetwork($input)
     {
-        if ($this->networkRange === null) {
+        if (null === $this->networkRange) {
             return true;
         }
 
diff --git a/library/Rules/IterableType.php b/library/Rules/IterableType.php
index d6a7f4db..2e50f046 100644
--- a/library/Rules/IterableType.php
+++ b/library/Rules/IterableType.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 class IterableType extends AbstractRule
diff --git a/library/Rules/Json.php b/library/Rules/Json.php
index b31fb1b9..5cf4b393 100644
--- a/library/Rules/Json.php
+++ b/library/Rules/Json.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 class Json extends AbstractRule
@@ -21,6 +23,6 @@ class Json extends AbstractRule
 
         json_decode($input);
 
-        return json_last_error() === JSON_ERROR_NONE;
+        return JSON_ERROR_NONE === json_last_error();
     }
 }
diff --git a/library/Rules/Key.php b/library/Rules/Key.php
index 91e3633e..c20fcbf3 100644
--- a/library/Rules/Key.php
+++ b/library/Rules/Key.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 use Respect\Validation\Exceptions\ComponentException;
diff --git a/library/Rules/KeyNested.php b/library/Rules/KeyNested.php
index c2c07a47..5129909f 100644
--- a/library/Rules/KeyNested.php
+++ b/library/Rules/KeyNested.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 use ArrayAccess;
@@ -29,7 +31,7 @@ class KeyNested extends AbstractRelated
 
     private function getReferencePieces()
     {
-        return explode('.', rtrim($this->reference, '.'));
+        return explode('.', rtrim((string) $this->reference, '.'));
     }
 
     private function getValueFromArray($array, $key)
diff --git a/library/Rules/KeySet.php b/library/Rules/KeySet.php
index a3fc1a26..4932ae79 100644
--- a/library/Rules/KeySet.php
+++ b/library/Rules/KeySet.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 use Respect\Validation\Exceptions\ComponentException;
@@ -30,7 +32,7 @@ class KeySet extends AllOf
     private function filterAllOf(AllOf $rule)
     {
         $rules = $rule->getRules();
-        if (count($rules) != 1) {
+        if (1 != count($rules)) {
             throw new ComponentException('AllOf rule must have only one Key rule');
         }
 
@@ -99,13 +101,13 @@ class KeySet extends AllOf
             unset($input[$keyRule->reference]);
         }
 
-        return count($input) == 0;
+        return 0 == count($input);
     }
 
     /**
      * @throws KeySetException
      */
-    private function checkKeys($input)
+    private function checkKeys($input): void
     {
         if (!$this->hasValidStructure($input)) {
             $params = ['keys' => $this->getKeys()];
diff --git a/library/Rules/KeyValue.php b/library/Rules/KeyValue.php
index a1509183..51c4445d 100644
--- a/library/Rules/KeyValue.php
+++ b/library/Rules/KeyValue.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 use Respect\Validation\Exceptions\ComponentException;
diff --git a/library/Rules/LanguageCode.php b/library/Rules/LanguageCode.php
index 5220bf69..19c7acf1 100644
--- a/library/Rules/LanguageCode.php
+++ b/library/Rules/LanguageCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 use Respect\Validation\Exceptions\ComponentException;
@@ -22,7 +24,7 @@ class LanguageCode extends AbstractRule
     const ALPHA3 = 'alpha-3';
 
     /**
-     * @link http://www.loc.gov/standards/iso639-2/ISO-639-2_utf-8.txt
+     * @see http://www.loc.gov/standards/iso639-2/ISO-639-2_utf-8.txt
      *
      * @var array
      */
diff --git a/library/Rules/LeapDate.php b/library/Rules/LeapDate.php
index eaf0452c..ff95c31a 100644
--- a/library/Rules/LeapDate.php
+++ b/library/Rules/LeapDate.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 use DateTimeImmutable;
@@ -34,6 +36,6 @@ class LeapDate extends AbstractRule
         }
 
         // Dates that aren't leap will aways be rounded
-        return $date->format('m-d') == '02-29';
+        return '02-29' == $date->format('m-d');
     }
 }
diff --git a/library/Rules/LeapYear.php b/library/Rules/LeapYear.php
index 7bb40356..d0a91461 100644
--- a/library/Rules/LeapYear.php
+++ b/library/Rules/LeapYear.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 use DateTimeInterface;
@@ -20,7 +22,7 @@ class LeapYear extends AbstractRule
         if (is_numeric($year)) {
             $year = (int) $year;
         } elseif (is_string($year)) {
-            $year = (int) date('Y', strtotime($year));
+            $year = (int) date('Y', (int) strtotime($year));
         } elseif ($year instanceof DateTimeInterface) {
             $year = (int) $year->format('Y');
         } else {
@@ -29,6 +31,6 @@ class LeapYear extends AbstractRule
 
         $date = strtotime(sprintf('%d-02-29', $year));
 
-        return (bool) date('L', $date);
+        return (bool) date('L', (int) $date);
     }
 }
diff --git a/library/Rules/Length.php b/library/Rules/Length.php
index 340f71c1..2283f4c5 100644
--- a/library/Rules/Length.php
+++ b/library/Rules/Length.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 use Respect\Validation\Exceptions\ComponentException;
diff --git a/library/Rules/Locale/PlIdentityCard.php b/library/Rules/Locale/PlIdentityCard.php
index 83d5a0d1..ed17bbd1 100644
--- a/library/Rules/Locale/PlIdentityCard.php
+++ b/library/Rules/Locale/PlIdentityCard.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\Locale;
 
 use Respect\Validation\Rules\AbstractRule;
@@ -16,7 +18,7 @@ use Respect\Validation\Rules\AbstractRule;
 /**
  * Validator for Polish identity card.
  *
- * @link https://en.wikipedia.org/wiki/Polish_identity_card
+ * @see https://en.wikipedia.org/wiki/Polish_identity_card
  */
 class PlIdentityCard extends AbstractRule
 {
diff --git a/library/Rules/Locale/PlVatin.php b/library/Rules/Locale/PlVatin.php
index 526d766d..78696f25 100644
--- a/library/Rules/Locale/PlVatin.php
+++ b/library/Rules/Locale/PlVatin.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\Locale;
 
 use Respect\Validation\Rules\AbstractRule;
@@ -16,7 +18,7 @@ use Respect\Validation\Rules\AbstractRule;
 /**
  * Validator for Polish VAT identification number (NIP).
  *
- * @link https://en.wikipedia.org/wiki/VAT_identification_number
+ * @see https://en.wikipedia.org/wiki/VAT_identification_number
  */
 final class PlVatin extends AbstractRule
 {
diff --git a/library/Rules/Lowercase.php b/library/Rules/Lowercase.php
index 3c676d43..ad110d77 100644
--- a/library/Rules/Lowercase.php
+++ b/library/Rules/Lowercase.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 class Lowercase extends AbstractRule
diff --git a/library/Rules/Luhn.php b/library/Rules/Luhn.php
index bd7d4c93..2ac9dc40 100644
--- a/library/Rules/Luhn.php
+++ b/library/Rules/Luhn.php
@@ -9,10 +9,12 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 /**
- * @link https://en.wikipedia.org/wiki/Luhn_algorithm
+ * @see https://en.wikipedia.org/wiki/Luhn_algorithm
  */
 class Luhn extends AbstractRule
 {
@@ -31,10 +33,10 @@ class Luhn extends AbstractRule
     private function isValid($input): bool
     {
         $sum = 0;
-        $numDigits = strlen($input);
+        $numDigits = mb_strlen($input);
         $parity = $numDigits % 2;
         for ($i = 0; $i < $numDigits; ++$i) {
-            $digit = substr($input, $i, 1);
+            $digit = mb_substr($input, $i, 1);
             if ($parity == ($i % 2)) {
                 $digit <<= 1;
                 if (9 < $digit) {
diff --git a/library/Rules/MacAddress.php b/library/Rules/MacAddress.php
index 012fdc5a..c6a10094 100644
--- a/library/Rules/MacAddress.php
+++ b/library/Rules/MacAddress.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 class MacAddress extends AbstractRule
diff --git a/library/Rules/Max.php b/library/Rules/Max.php
index 2bad5800..628ef9a8 100644
--- a/library/Rules/Max.php
+++ b/library/Rules/Max.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 class Max extends AbstractInterval
diff --git a/library/Rules/Mimetype.php b/library/Rules/Mimetype.php
index b8cf1f40..20bcd53c 100644
--- a/library/Rules/Mimetype.php
+++ b/library/Rules/Mimetype.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 use finfo;
diff --git a/library/Rules/Min.php b/library/Rules/Min.php
index 994e813b..81cf11ab 100644
--- a/library/Rules/Min.php
+++ b/library/Rules/Min.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 class Min extends AbstractInterval
diff --git a/library/Rules/MinimumAge.php b/library/Rules/MinimumAge.php
index f7ff71fa..cca3891c 100644
--- a/library/Rules/MinimumAge.php
+++ b/library/Rules/MinimumAge.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 use DateTimeImmutable;
@@ -42,7 +44,7 @@ class MinimumAge extends AbstractRule
             return false;
         }
 
-        $age = ((date('Ymd') - date('Ymd', strtotime($input))) / 10000);
+        $age = ((date('Ymd') - date('Ymd', (int) strtotime($input))) / 10000);
 
         return $age >= $this->age;
     }
diff --git a/library/Rules/Multiple.php b/library/Rules/Multiple.php
index dfa23965..9bee9934 100644
--- a/library/Rules/Multiple.php
+++ b/library/Rules/Multiple.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 class Multiple extends AbstractRule
@@ -22,10 +24,10 @@ class Multiple extends AbstractRule
 
     public function validate($input)
     {
-        if ($this->multipleOf == 0) {
-            return $input == 0;
+        if (0 == $this->multipleOf) {
+            return 0 == $input;
         }
 
-        return $input % $this->multipleOf == 0;
+        return 0 == $input % $this->multipleOf;
     }
 }
diff --git a/library/Rules/Negative.php b/library/Rules/Negative.php
index 433f5741..884d343b 100644
--- a/library/Rules/Negative.php
+++ b/library/Rules/Negative.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 class Negative extends AbstractRule
diff --git a/library/Rules/NfeAccessKey.php b/library/Rules/NfeAccessKey.php
index 48a13fe4..b586dcdd 100644
--- a/library/Rules/NfeAccessKey.php
+++ b/library/Rules/NfeAccessKey.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 /**
@@ -28,24 +30,24 @@ class NfeAccessKey extends AbstractRule
      */
     public function validate($aK)
     {
-        if (mb_strlen($aK) !== 44) {
+        if (44 !== mb_strlen($aK)) {
             return false;
         }
 
         $w = [];
         for ($i = 0, $z = 5, $m = 43; $i <= $m; ++$i) {
-            $z = ($i < $m) ? ($z - 1) == 1 ? 9 : ($z - 1) : 0;
+            $z = ($i < $m) ? 1 == ($z - 1) ? 9 : ($z - 1) : 0;
             $w[] = $z;
         }
 
         for ($i = 0, $s = 0, $k = 44; $i < $k; ++$i) {
-            $s += $aK{ $i }
-            * $w[ $i ];
+            $s += $aK[$i]
+            * $w[$i];
         }
 
         $s -= (11 * floor($s / 11));
-        $v = ($s == 0 || $s == 1) ? 0 : (11 - $s);
+        $v = (0 == $s || 1 == $s) ? 0 : (11 - $s);
 
-        return $v == $aK{ 43 };
+        return $v == $aK[43];
     }
 }
diff --git a/library/Rules/Nif.php b/library/Rules/Nif.php
index 007876e5..b06d2c7a 100644
--- a/library/Rules/Nif.php
+++ b/library/Rules/Nif.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 /**
@@ -60,11 +62,11 @@ final class Nif extends AbstractRule
      */
     private function validateNie($prefix, $number, $control)
     {
-        if ($prefix === 'Y') {
+        if ('Y' === $prefix) {
             return $this->validateDni('1'.$number, $control);
         }
 
-        if ($prefix === 'Z') {
+        if ('Z' === $prefix) {
             return $this->validateDni('2'.$number, $control);
         }
 
@@ -75,23 +77,23 @@ final class Nif extends AbstractRule
      * @param int    $number
      * @param string $control
      */
-    private function validateCif($number, $control)
+    private function validateCif(string $number, $control)
     {
         $code = 0;
         $position = 1;
         foreach (str_split($number) as $digit) {
             $increaser = $digit;
-            if ($position % 2 !== 0) {
-                $increaser = array_sum(str_split($digit * 2));
+            if (0 !== $position % 2) {
+                $increaser = array_sum(str_split((string) ($digit * 2)));
             }
 
             $code += $increaser;
             ++$position;
         }
 
-        $digits = str_split($code);
+        $digits = str_split((string) $code);
         $lastDigit = (int) array_pop($digits);
-        $key = $lastDigit === 0 ? 0 : (10 - $lastDigit);
+        $key = 0 === $lastDigit ? 0 : (10 - $lastDigit);
 
         if (is_numeric($control)) {
             return (int) $key === (int) $control;
diff --git a/library/Rules/No.php b/library/Rules/No.php
index 88c99a07..51820ec6 100644
--- a/library/Rules/No.php
+++ b/library/Rules/No.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 class No extends Regex
diff --git a/library/Rules/NoWhitespace.php b/library/Rules/NoWhitespace.php
index bdf9e44e..91795894 100644
--- a/library/Rules/NoWhitespace.php
+++ b/library/Rules/NoWhitespace.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 class NoWhitespace extends AbstractRule
@@ -23,6 +25,6 @@ class NoWhitespace extends AbstractRule
             return false;
         }
 
-        return !preg_match('#\s#', $input);
+        return !preg_match('#\s#', (string) $input);
     }
 }
diff --git a/library/Rules/NoneOf.php b/library/Rules/NoneOf.php
index 06faac96..97bc4ff1 100644
--- a/library/Rules/NoneOf.php
+++ b/library/Rules/NoneOf.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 class NoneOf extends AbstractComposite
diff --git a/library/Rules/Not.php b/library/Rules/Not.php
index 42d0966f..eaf59c7a 100644
--- a/library/Rules/Not.php
+++ b/library/Rules/Not.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 use Respect\Validation\Exceptions\ValidationException;
diff --git a/library/Rules/NotBlank.php b/library/Rules/NotBlank.php
index 54602628..54ab06fa 100644
--- a/library/Rules/NotBlank.php
+++ b/library/Rules/NotBlank.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 use stdClass;
@@ -18,7 +20,7 @@ class NotBlank extends AbstractRule
     public function validate($input)
     {
         if (is_numeric($input)) {
-            return $input != 0;
+            return 0 != $input;
         }
 
         if (is_string($input)) {
diff --git a/library/Rules/NotEmpty.php b/library/Rules/NotEmpty.php
index fe7a93a9..02eeb13a 100644
--- a/library/Rules/NotEmpty.php
+++ b/library/Rules/NotEmpty.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 class NotEmpty extends AbstractRule
diff --git a/library/Rules/NotOptional.php b/library/Rules/NotOptional.php
index 6296707d..431238c9 100644
--- a/library/Rules/NotOptional.php
+++ b/library/Rules/NotOptional.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 class NotOptional extends AbstractRule
diff --git a/library/Rules/NullType.php b/library/Rules/NullType.php
index c323cd40..5d796c1b 100644
--- a/library/Rules/NullType.php
+++ b/library/Rules/NullType.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 class NullType extends NotEmpty
diff --git a/library/Rules/Number.php b/library/Rules/Number.php
index e7b3e842..367de932 100644
--- a/library/Rules/Number.php
+++ b/library/Rules/Number.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 class Number extends AbstractRule
@@ -19,6 +21,6 @@ class Number extends AbstractRule
             return false;
         }
 
-        return !is_nan($input);
+        return !is_nan((float) $input);
     }
 }
diff --git a/library/Rules/NumericVal.php b/library/Rules/NumericVal.php
index ad2684b8..80c5a04c 100644
--- a/library/Rules/NumericVal.php
+++ b/library/Rules/NumericVal.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 class NumericVal extends AbstractRule
diff --git a/library/Rules/ObjectType.php b/library/Rules/ObjectType.php
index 8105f04a..cae3913b 100644
--- a/library/Rules/ObjectType.php
+++ b/library/Rules/ObjectType.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 class ObjectType extends AbstractRule
diff --git a/library/Rules/Odd.php b/library/Rules/Odd.php
index de26870a..74131a68 100644
--- a/library/Rules/Odd.php
+++ b/library/Rules/Odd.php
@@ -9,12 +9,14 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 class Odd extends AbstractRule
 {
     public function validate($input)
     {
-        return (int) $input % 2 !== 0;
+        return 0 !== (int) $input % 2;
     }
 }
diff --git a/library/Rules/OneOf.php b/library/Rules/OneOf.php
index b93ef650..06d06bd8 100644
--- a/library/Rules/OneOf.php
+++ b/library/Rules/OneOf.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 use Respect\Validation\Exceptions\ValidationException;
@@ -43,7 +45,7 @@ class OneOf extends AbstractComposite
             ++$rulesPassedCount;
         }
 
-        return $rulesPassedCount === 1;
+        return 1 === $rulesPassedCount;
     }
 
     public function check($input)
@@ -60,7 +62,7 @@ class OneOf extends AbstractComposite
             }
         }
 
-        if ($rulesPassedCount === 1) {
+        if (1 === $rulesPassedCount) {
             return true;
         }
 
diff --git a/library/Rules/Optional.php b/library/Rules/Optional.php
index 1fd5592f..253e4961 100644
--- a/library/Rules/Optional.php
+++ b/library/Rules/Optional.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 use Respect\Validation\Validatable;
diff --git a/library/Rules/PerfectSquare.php b/library/Rules/PerfectSquare.php
index cf216c0c..f3ab70dc 100644
--- a/library/Rules/PerfectSquare.php
+++ b/library/Rules/PerfectSquare.php
@@ -9,12 +9,14 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 class PerfectSquare extends AbstractRule
 {
     public function validate($input)
     {
-        return is_numeric($input) && floor(sqrt($input)) == sqrt($input);
+        return is_numeric($input) && floor(sqrt((float) $input)) == sqrt((float) $input);
     }
 }
diff --git a/library/Rules/Pesel.php b/library/Rules/Pesel.php
index d8cda0fe..ff76f1c7 100644
--- a/library/Rules/Pesel.php
+++ b/library/Rules/Pesel.php
@@ -9,13 +9,15 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 class Pesel extends AbstractRule
 {
     public function validate($input)
     {
-        if (!preg_match('/^\d{11}$/', $input)) {
+        if (!preg_match('/^\d{11}$/', (string) $input)) {
             return false;
         }
 
diff --git a/library/Rules/Phone.php b/library/Rules/Phone.php
index 658970f6..dcbdf7c6 100644
--- a/library/Rules/Phone.php
+++ b/library/Rules/Phone.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 class Phone extends AbstractRegexRule
diff --git a/library/Rules/PhpLabel.php b/library/Rules/PhpLabel.php
index 298af8e2..8f1f482f 100644
--- a/library/Rules/PhpLabel.php
+++ b/library/Rules/PhpLabel.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 class PhpLabel extends AbstractRule
diff --git a/library/Rules/Pis.php b/library/Rules/Pis.php
index 7f70e96b..84361052 100644
--- a/library/Rules/Pis.php
+++ b/library/Rules/Pis.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 /**
@@ -29,7 +31,7 @@ class Pis extends AbstractRule
         }
 
         $digits = preg_replace('/\D/', '', $input);
-        if (mb_strlen($digits) != 11 || preg_match("/^{$digits[0]}{11}$/", $digits)) {
+        if (11 != mb_strlen($digits) || preg_match("/^{$digits[0]}{11}$/", $digits)) {
             return false;
         }
 
diff --git a/library/Rules/Positive.php b/library/Rules/Positive.php
index c192af9e..80b61a5b 100644
--- a/library/Rules/Positive.php
+++ b/library/Rules/Positive.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 class Positive extends AbstractRule
diff --git a/library/Rules/PostalCode.php b/library/Rules/PostalCode.php
index 03f1dc1c..2311b335 100644
--- a/library/Rules/PostalCode.php
+++ b/library/Rules/PostalCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 use Respect\Validation\Exceptions\ComponentException;
@@ -18,7 +20,7 @@ class PostalCode extends Regex
     const DEFAULT_PATTERN = '/^$/';
 
     /**
-     * @link http://download.geonames.org/export/dump/countryInfo.txt
+     * @see http://download.geonames.org/export/dump/countryInfo.txt
      */
     public $postalCodes = [
         'AD' => "/^(?:AD)*(\d{3})$/",
diff --git a/library/Rules/PrimeNumber.php b/library/Rules/PrimeNumber.php
index d5c7e8e7..8848350c 100644
--- a/library/Rules/PrimeNumber.php
+++ b/library/Rules/PrimeNumber.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 class PrimeNumber extends AbstractRule
@@ -19,12 +21,12 @@ class PrimeNumber extends AbstractRule
             return false;
         }
 
-        if ($input != 2 && ($input % 2) == 0) {
+        if (2 != $input && 0 == ($input % 2)) {
             return false;
         }
 
-        for ($i = 3; $i <= ceil(sqrt($input)); $i += 2) {
-            if (($input % $i) == 0) {
+        for ($i = 3; $i <= ceil(sqrt((float) $input)); $i += 2) {
+            if (0 == ($input % $i)) {
                 return false;
             }
         }
diff --git a/library/Rules/Prnt.php b/library/Rules/Prnt.php
index 333f791c..2d8ef19d 100644
--- a/library/Rules/Prnt.php
+++ b/library/Rules/Prnt.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 class Prnt extends AbstractCtypeRule
diff --git a/library/Rules/Punct.php b/library/Rules/Punct.php
index 4e0649c4..cca01de1 100644
--- a/library/Rules/Punct.php
+++ b/library/Rules/Punct.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 class Punct extends AbstractCtypeRule
diff --git a/library/Rules/Readable.php b/library/Rules/Readable.php
index 4f04dfcf..f2bdc448 100644
--- a/library/Rules/Readable.php
+++ b/library/Rules/Readable.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 class Readable extends AbstractRule
diff --git a/library/Rules/Regex.php b/library/Rules/Regex.php
index 1752dea3..c7fc5b5d 100644
--- a/library/Rules/Regex.php
+++ b/library/Rules/Regex.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 class Regex extends AbstractRule
@@ -26,6 +28,6 @@ class Regex extends AbstractRule
             return false;
         }
 
-        return (bool) preg_match($this->regex, $input);
+        return (bool) preg_match($this->regex, (string) $input);
     }
 }
diff --git a/library/Rules/ResourceType.php b/library/Rules/ResourceType.php
index e0c2d1e4..f5f4a355 100644
--- a/library/Rules/ResourceType.php
+++ b/library/Rules/ResourceType.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 /**
diff --git a/library/Rules/Roman.php b/library/Rules/Roman.php
index cd43415d..a9b97456 100644
--- a/library/Rules/Roman.php
+++ b/library/Rules/Roman.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 class Roman extends Regex
diff --git a/library/Rules/ScalarVal.php b/library/Rules/ScalarVal.php
index 59ed7e12..a50cea1c 100644
--- a/library/Rules/ScalarVal.php
+++ b/library/Rules/ScalarVal.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 /**
diff --git a/library/Rules/Sf.php b/library/Rules/Sf.php
index b186d678..0dc0db4a 100644
--- a/library/Rules/Sf.php
+++ b/library/Rules/Sf.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 use ReflectionClass;
@@ -56,7 +58,7 @@ class Sf extends AbstractRule
     public function assert($input)
     {
         $violations = $this->returnViolationsForConstraint($input, $this->constraint);
-        if (count($violations) == 0) {
+        if (0 == count($violations)) {
             return true;
         }
 
diff --git a/library/Rules/Size.php b/library/Rules/Size.php
index 04eb1845..ea1c9a90 100644
--- a/library/Rules/Size.php
+++ b/library/Rules/Size.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 use Respect\Validation\Exceptions\ComponentException;
@@ -65,10 +67,10 @@ class Size extends AbstractRule
         $value = $size;
         $units = ['b', 'kb', 'mb', 'gb', 'tb', 'pb', 'eb', 'zb', 'yb'];
         foreach ($units as $exponent => $unit) {
-            if (!preg_match("/^(\d+(.\d+)?){$unit}$/i", $size, $matches)) {
+            if (!preg_match("/^(\d+(.\d+)?){$unit}$/i", (string) $size, $matches)) {
                 continue;
             }
-            $value = $matches[1] * pow(1024, $exponent);
+            $value = $matches[1] * 1024 ** $exponent;
             break;
         }
 
diff --git a/library/Rules/Slug.php b/library/Rules/Slug.php
index a5400665..b55041ee 100644
--- a/library/Rules/Slug.php
+++ b/library/Rules/Slug.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 class Slug extends AbstractRule
diff --git a/library/Rules/Sorted.php b/library/Rules/Sorted.php
index 83a99018..cce75d4a 100644
--- a/library/Rules/Sorted.php
+++ b/library/Rules/Sorted.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 class Sorted extends AbstractRule
@@ -18,7 +20,7 @@ class Sorted extends AbstractRule
 
     public function __construct(callable $fn = null, bool $ascending = true)
     {
-        $this->fn = $fn ?? function ($x) { return $x;};
+        $this->fn = $fn ?? function ($x) { return $x; };
         $this->ascending = $ascending;
     }
 
diff --git a/library/Rules/Space.php b/library/Rules/Space.php
index 47d34d29..bacafaa6 100644
--- a/library/Rules/Space.php
+++ b/library/Rules/Space.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 class Space extends AbstractCtypeRule
diff --git a/library/Rules/StartsWith.php b/library/Rules/StartsWith.php
index 96e7d7be..503f94f5 100644
--- a/library/Rules/StartsWith.php
+++ b/library/Rules/StartsWith.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 class StartsWith extends AbstractRule
diff --git a/library/Rules/StringType.php b/library/Rules/StringType.php
index 420e0a04..5dd5c8cd 100644
--- a/library/Rules/StringType.php
+++ b/library/Rules/StringType.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 class StringType extends AbstractRule
diff --git a/library/Rules/StringVal.php b/library/Rules/StringVal.php
index d64602fc..f2d7662d 100644
--- a/library/Rules/StringVal.php
+++ b/library/Rules/StringVal.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 class StringVal extends AbstractRule
diff --git a/library/Rules/SubdivisionCode.php b/library/Rules/SubdivisionCode.php
index 0e9cf2bb..23a9512d 100644
--- a/library/Rules/SubdivisionCode.php
+++ b/library/Rules/SubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 use Respect\Validation\Exceptions\ComponentException;
@@ -16,8 +18,8 @@ use Respect\Validation\Exceptions\ComponentException;
 /**
  * Validates country subdivision codes according to ISO 3166-2.
  *
- * @link http://en.wikipedia.org/wiki/ISO_3166-2
- * @link http://www.geonames.org/countries/
+ * @see http://en.wikipedia.org/wiki/ISO_3166-2
+ * @see http://www.geonames.org/countries/
  */
 class SubdivisionCode extends AbstractWrapper
 {
diff --git a/library/Rules/SubdivisionCode/AdSubdivisionCode.php b/library/Rules/SubdivisionCode/AdSubdivisionCode.php
index 1b836dad..05fae5d7 100644
--- a/library/Rules/SubdivisionCode/AdSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/AdSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: AD
  *
- * @link http://www.geonames.org/AD/administrative-division-andorra.html
+ * @see http://www.geonames.org/AD/administrative-division-andorra.html
  */
 class AdSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/AeSubdivisionCode.php b/library/Rules/SubdivisionCode/AeSubdivisionCode.php
index 3a42ea17..a2d724e3 100644
--- a/library/Rules/SubdivisionCode/AeSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/AeSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: AE
  *
- * @link http://www.geonames.org/AE/administrative-division-united-arab-emirates.html
+ * @see http://www.geonames.org/AE/administrative-division-united-arab-emirates.html
  */
 class AeSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/AfSubdivisionCode.php b/library/Rules/SubdivisionCode/AfSubdivisionCode.php
index 61e7a9eb..57b87a4c 100644
--- a/library/Rules/SubdivisionCode/AfSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/AfSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: AF
  *
- * @link http://www.geonames.org/AF/administrative-division-afghanistan.html
+ * @see http://www.geonames.org/AF/administrative-division-afghanistan.html
  */
 class AfSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/AgSubdivisionCode.php b/library/Rules/SubdivisionCode/AgSubdivisionCode.php
index 73d379d9..c167a79c 100644
--- a/library/Rules/SubdivisionCode/AgSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/AgSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: AG
  *
- * @link http://www.geonames.org/AG/administrative-division-antigua-and-barbuda.html
+ * @see http://www.geonames.org/AG/administrative-division-antigua-and-barbuda.html
  */
 class AgSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/AiSubdivisionCode.php b/library/Rules/SubdivisionCode/AiSubdivisionCode.php
index e2b23128..701c74e8 100644
--- a/library/Rules/SubdivisionCode/AiSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/AiSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: AI
  *
- * @link http://www.geonames.org/AI/administrative-division-anguilla.html
+ * @see http://www.geonames.org/AI/administrative-division-anguilla.html
  */
 class AiSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/AlSubdivisionCode.php b/library/Rules/SubdivisionCode/AlSubdivisionCode.php
index 97ac19fe..21f46945 100644
--- a/library/Rules/SubdivisionCode/AlSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/AlSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: AL
  *
- * @link http://www.geonames.org/AL/administrative-division-albania.html
+ * @see http://www.geonames.org/AL/administrative-division-albania.html
  */
 class AlSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/AmSubdivisionCode.php b/library/Rules/SubdivisionCode/AmSubdivisionCode.php
index c8132c35..e24ee8f7 100644
--- a/library/Rules/SubdivisionCode/AmSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/AmSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: AM
  *
- * @link http://www.geonames.org/AM/administrative-division-armenia.html
+ * @see http://www.geonames.org/AM/administrative-division-armenia.html
  */
 class AmSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/AnSubdivisionCode.php b/library/Rules/SubdivisionCode/AnSubdivisionCode.php
index cc755ec4..654cd83b 100644
--- a/library/Rules/SubdivisionCode/AnSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/AnSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: AN
  *
- * @link http://www.geonames.org/AN/administrative-division-netherlands-antilles.html
+ * @see http://www.geonames.org/AN/administrative-division-netherlands-antilles.html
  */
 class AnSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/AoSubdivisionCode.php b/library/Rules/SubdivisionCode/AoSubdivisionCode.php
index 5d589303..327775bf 100644
--- a/library/Rules/SubdivisionCode/AoSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/AoSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: AO
  *
- * @link http://www.geonames.org/AO/administrative-division-angola.html
+ * @see http://www.geonames.org/AO/administrative-division-angola.html
  */
 class AoSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/AqSubdivisionCode.php b/library/Rules/SubdivisionCode/AqSubdivisionCode.php
index 2fe6a6db..18adc83b 100644
--- a/library/Rules/SubdivisionCode/AqSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/AqSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: AQ
  *
- * @link http://www.geonames.org/AQ/administrative-division-antarctica.html
+ * @see http://www.geonames.org/AQ/administrative-division-antarctica.html
  */
 class AqSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/ArSubdivisionCode.php b/library/Rules/SubdivisionCode/ArSubdivisionCode.php
index 204ce8af..8fbd4fd6 100644
--- a/library/Rules/SubdivisionCode/ArSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/ArSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: AR
  *
- * @link http://www.geonames.org/AR/administrative-division-argentina.html
+ * @see http://www.geonames.org/AR/administrative-division-argentina.html
  */
 class ArSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/AsSubdivisionCode.php b/library/Rules/SubdivisionCode/AsSubdivisionCode.php
index a8dd9c85..81683f1e 100644
--- a/library/Rules/SubdivisionCode/AsSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/AsSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: AS
  *
- * @link http://www.geonames.org/AS/administrative-division-american-samoa.html
+ * @see http://www.geonames.org/AS/administrative-division-american-samoa.html
  */
 class AsSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/AtSubdivisionCode.php b/library/Rules/SubdivisionCode/AtSubdivisionCode.php
index 77e64b27..a3d88c0e 100644
--- a/library/Rules/SubdivisionCode/AtSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/AtSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: AT
  *
- * @link http://www.geonames.org/AT/administrative-division-austria.html
+ * @see http://www.geonames.org/AT/administrative-division-austria.html
  */
 class AtSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/AuSubdivisionCode.php b/library/Rules/SubdivisionCode/AuSubdivisionCode.php
index db52e371..94da6b5b 100644
--- a/library/Rules/SubdivisionCode/AuSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/AuSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: AU
  *
- * @link http://www.geonames.org/AU/administrative-division-australia.html
+ * @see http://www.geonames.org/AU/administrative-division-australia.html
  */
 class AuSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/AwSubdivisionCode.php b/library/Rules/SubdivisionCode/AwSubdivisionCode.php
index 575424de..3bded132 100644
--- a/library/Rules/SubdivisionCode/AwSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/AwSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: AW
  *
- * @link http://www.geonames.org/AW/administrative-division-aruba.html
+ * @see http://www.geonames.org/AW/administrative-division-aruba.html
  */
 class AwSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/AxSubdivisionCode.php b/library/Rules/SubdivisionCode/AxSubdivisionCode.php
index 0041a6c2..473b6c6e 100644
--- a/library/Rules/SubdivisionCode/AxSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/AxSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: AX
  *
- * @link http://www.geonames.org/AX/administrative-division-aland.html
+ * @see http://www.geonames.org/AX/administrative-division-aland.html
  */
 class AxSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/AzSubdivisionCode.php b/library/Rules/SubdivisionCode/AzSubdivisionCode.php
index 94d08f0d..717577ca 100644
--- a/library/Rules/SubdivisionCode/AzSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/AzSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: AZ
  *
- * @link http://www.geonames.org/AZ/administrative-division-azerbaijan.html
+ * @see http://www.geonames.org/AZ/administrative-division-azerbaijan.html
  */
 class AzSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/BaSubdivisionCode.php b/library/Rules/SubdivisionCode/BaSubdivisionCode.php
index 558164ec..26e862a9 100644
--- a/library/Rules/SubdivisionCode/BaSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/BaSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: BA
  *
- * @link http://www.geonames.org/BA/administrative-division-bosnia-and-herzegovina.html
+ * @see http://www.geonames.org/BA/administrative-division-bosnia-and-herzegovina.html
  */
 class BaSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/BbSubdivisionCode.php b/library/Rules/SubdivisionCode/BbSubdivisionCode.php
index 2ab08369..777d273c 100644
--- a/library/Rules/SubdivisionCode/BbSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/BbSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: BB
  *
- * @link http://www.geonames.org/BB/administrative-division-barbados.html
+ * @see http://www.geonames.org/BB/administrative-division-barbados.html
  */
 class BbSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/BdSubdivisionCode.php b/library/Rules/SubdivisionCode/BdSubdivisionCode.php
index 750753e4..e2fd7df7 100644
--- a/library/Rules/SubdivisionCode/BdSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/BdSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: BD
  *
- * @link http://www.geonames.org/BD/administrative-division-bangladesh.html
+ * @see http://www.geonames.org/BD/administrative-division-bangladesh.html
  */
 class BdSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/BeSubdivisionCode.php b/library/Rules/SubdivisionCode/BeSubdivisionCode.php
index 44d0c7ef..2f54e4ca 100644
--- a/library/Rules/SubdivisionCode/BeSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/BeSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: BE
  *
- * @link http://www.geonames.org/BE/administrative-division-belgium.html
+ * @see http://www.geonames.org/BE/administrative-division-belgium.html
  */
 class BeSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/BfSubdivisionCode.php b/library/Rules/SubdivisionCode/BfSubdivisionCode.php
index a0a99e8a..0bde38ab 100644
--- a/library/Rules/SubdivisionCode/BfSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/BfSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: BF
  *
- * @link http://www.geonames.org/BF/administrative-division-burkina-faso.html
+ * @see http://www.geonames.org/BF/administrative-division-burkina-faso.html
  */
 class BfSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/BgSubdivisionCode.php b/library/Rules/SubdivisionCode/BgSubdivisionCode.php
index c484a23d..9eca398b 100644
--- a/library/Rules/SubdivisionCode/BgSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/BgSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: BG
  *
- * @link http://www.geonames.org/BG/administrative-division-bulgaria.html
+ * @see http://www.geonames.org/BG/administrative-division-bulgaria.html
  */
 class BgSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/BhSubdivisionCode.php b/library/Rules/SubdivisionCode/BhSubdivisionCode.php
index 20246a81..5e39650e 100644
--- a/library/Rules/SubdivisionCode/BhSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/BhSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: BH
  *
- * @link http://www.geonames.org/BH/administrative-division-bahrain.html
+ * @see http://www.geonames.org/BH/administrative-division-bahrain.html
  */
 class BhSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/BiSubdivisionCode.php b/library/Rules/SubdivisionCode/BiSubdivisionCode.php
index 3282ac2a..c1f0ac6d 100644
--- a/library/Rules/SubdivisionCode/BiSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/BiSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: BI
  *
- * @link http://www.geonames.org/BI/administrative-division-burundi.html
+ * @see http://www.geonames.org/BI/administrative-division-burundi.html
  */
 class BiSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/BjSubdivisionCode.php b/library/Rules/SubdivisionCode/BjSubdivisionCode.php
index 8a7f4432..1008f6ed 100644
--- a/library/Rules/SubdivisionCode/BjSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/BjSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: BJ
  *
- * @link http://www.geonames.org/BJ/administrative-division-benin.html
+ * @see http://www.geonames.org/BJ/administrative-division-benin.html
  */
 class BjSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/BlSubdivisionCode.php b/library/Rules/SubdivisionCode/BlSubdivisionCode.php
index 17e777d9..fd064682 100644
--- a/library/Rules/SubdivisionCode/BlSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/BlSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: BL
  *
- * @link http://www.geonames.org/BL/administrative-division-saint-barthelemy.html
+ * @see http://www.geonames.org/BL/administrative-division-saint-barthelemy.html
  */
 class BlSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/BmSubdivisionCode.php b/library/Rules/SubdivisionCode/BmSubdivisionCode.php
index 137ff33b..2960c620 100644
--- a/library/Rules/SubdivisionCode/BmSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/BmSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: BM
  *
- * @link http://www.geonames.org/BM/administrative-division-bermuda.html
+ * @see http://www.geonames.org/BM/administrative-division-bermuda.html
  */
 class BmSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/BnSubdivisionCode.php b/library/Rules/SubdivisionCode/BnSubdivisionCode.php
index 776c92ba..ff3ffdd9 100644
--- a/library/Rules/SubdivisionCode/BnSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/BnSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: BN
  *
- * @link http://www.geonames.org/BN/administrative-division-brunei.html
+ * @see http://www.geonames.org/BN/administrative-division-brunei.html
  */
 class BnSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/BoSubdivisionCode.php b/library/Rules/SubdivisionCode/BoSubdivisionCode.php
index ec6764a6..7942e506 100644
--- a/library/Rules/SubdivisionCode/BoSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/BoSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: BO
  *
- * @link http://www.geonames.org/BO/administrative-division-bolivia.html
+ * @see http://www.geonames.org/BO/administrative-division-bolivia.html
  */
 class BoSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/BqSubdivisionCode.php b/library/Rules/SubdivisionCode/BqSubdivisionCode.php
index 96aa5295..3b4d5fdb 100644
--- a/library/Rules/SubdivisionCode/BqSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/BqSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: BQ
  *
- * @link http://www.geonames.org/BQ/administrative-division-bonaire.html
+ * @see http://www.geonames.org/BQ/administrative-division-bonaire.html
  */
 class BqSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/BrSubdivisionCode.php b/library/Rules/SubdivisionCode/BrSubdivisionCode.php
index 6cab6a5c..6ae7146f 100644
--- a/library/Rules/SubdivisionCode/BrSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/BrSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: BR
  *
- * @link http://www.geonames.org/BR/administrative-division-brazil.html
+ * @see http://www.geonames.org/BR/administrative-division-brazil.html
  */
 class BrSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/BsSubdivisionCode.php b/library/Rules/SubdivisionCode/BsSubdivisionCode.php
index d8551d34..26aeb946 100644
--- a/library/Rules/SubdivisionCode/BsSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/BsSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: BS
  *
- * @link http://www.geonames.org/BS/administrative-division-bahamas.html
+ * @see http://www.geonames.org/BS/administrative-division-bahamas.html
  */
 class BsSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/BtSubdivisionCode.php b/library/Rules/SubdivisionCode/BtSubdivisionCode.php
index b32a3f6d..9077a81d 100644
--- a/library/Rules/SubdivisionCode/BtSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/BtSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: BT
  *
- * @link http://www.geonames.org/BT/administrative-division-bhutan.html
+ * @see http://www.geonames.org/BT/administrative-division-bhutan.html
  */
 class BtSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/BvSubdivisionCode.php b/library/Rules/SubdivisionCode/BvSubdivisionCode.php
index 9ef3f1cd..d9e7b0b0 100644
--- a/library/Rules/SubdivisionCode/BvSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/BvSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: BV
  *
- * @link http://www.geonames.org/BV/administrative-division-bouvet-island.html
+ * @see http://www.geonames.org/BV/administrative-division-bouvet-island.html
  */
 class BvSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/BwSubdivisionCode.php b/library/Rules/SubdivisionCode/BwSubdivisionCode.php
index 7dffd731..006300bc 100644
--- a/library/Rules/SubdivisionCode/BwSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/BwSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: BW
  *
- * @link http://www.geonames.org/BW/administrative-division-botswana.html
+ * @see http://www.geonames.org/BW/administrative-division-botswana.html
  */
 class BwSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/BySubdivisionCode.php b/library/Rules/SubdivisionCode/BySubdivisionCode.php
index 042e5372..aad89db3 100644
--- a/library/Rules/SubdivisionCode/BySubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/BySubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: BY
  *
- * @link http://www.geonames.org/BY/administrative-division-belarus.html
+ * @see http://www.geonames.org/BY/administrative-division-belarus.html
  */
 class BySubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/BzSubdivisionCode.php b/library/Rules/SubdivisionCode/BzSubdivisionCode.php
index 0b982806..9f74c3b4 100644
--- a/library/Rules/SubdivisionCode/BzSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/BzSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: BZ
  *
- * @link http://www.geonames.org/BZ/administrative-division-belize.html
+ * @see http://www.geonames.org/BZ/administrative-division-belize.html
  */
 class BzSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/CaSubdivisionCode.php b/library/Rules/SubdivisionCode/CaSubdivisionCode.php
index c6129355..b98b1fcf 100644
--- a/library/Rules/SubdivisionCode/CaSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/CaSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: CA
  *
- * @link http://www.geonames.org/CA/administrative-division-canada.html
+ * @see http://www.geonames.org/CA/administrative-division-canada.html
  */
 class CaSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/CcSubdivisionCode.php b/library/Rules/SubdivisionCode/CcSubdivisionCode.php
index aa6bdcfa..37410783 100644
--- a/library/Rules/SubdivisionCode/CcSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/CcSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: CC
  *
- * @link http://www.geonames.org/CC/administrative-division-cocos-islands.html
+ * @see http://www.geonames.org/CC/administrative-division-cocos-islands.html
  */
 class CcSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/CdSubdivisionCode.php b/library/Rules/SubdivisionCode/CdSubdivisionCode.php
index 5dd9dd8a..dc6a6060 100644
--- a/library/Rules/SubdivisionCode/CdSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/CdSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: CD
  *
- * @link http://www.geonames.org/CD/administrative-division-democratic-republic-of-the-congo.html
+ * @see http://www.geonames.org/CD/administrative-division-democratic-republic-of-the-congo.html
  */
 class CdSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/CfSubdivisionCode.php b/library/Rules/SubdivisionCode/CfSubdivisionCode.php
index caf54eab..6b29c48f 100644
--- a/library/Rules/SubdivisionCode/CfSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/CfSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: CF
  *
- * @link http://www.geonames.org/CF/administrative-division-central-african-republic.html
+ * @see http://www.geonames.org/CF/administrative-division-central-african-republic.html
  */
 class CfSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/CgSubdivisionCode.php b/library/Rules/SubdivisionCode/CgSubdivisionCode.php
index f2793aa5..25288ef4 100644
--- a/library/Rules/SubdivisionCode/CgSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/CgSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: CG
  *
- * @link http://www.geonames.org/CG/administrative-division-republic-of-the-congo.html
+ * @see http://www.geonames.org/CG/administrative-division-republic-of-the-congo.html
  */
 class CgSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/ChSubdivisionCode.php b/library/Rules/SubdivisionCode/ChSubdivisionCode.php
index dac06496..173806e5 100644
--- a/library/Rules/SubdivisionCode/ChSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/ChSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: CH
  *
- * @link http://www.geonames.org/CH/administrative-division-switzerland.html
+ * @see http://www.geonames.org/CH/administrative-division-switzerland.html
  */
 class ChSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/CiSubdivisionCode.php b/library/Rules/SubdivisionCode/CiSubdivisionCode.php
index 5f4db301..50a0badd 100644
--- a/library/Rules/SubdivisionCode/CiSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/CiSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: CI
  *
- * @link http://www.geonames.org/CI/administrative-division-ivory-coast.html
+ * @see http://www.geonames.org/CI/administrative-division-ivory-coast.html
  */
 class CiSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/CkSubdivisionCode.php b/library/Rules/SubdivisionCode/CkSubdivisionCode.php
index aa0d1bfc..ca6d0f37 100644
--- a/library/Rules/SubdivisionCode/CkSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/CkSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: CK
  *
- * @link http://www.geonames.org/CK/administrative-division-cook-islands.html
+ * @see http://www.geonames.org/CK/administrative-division-cook-islands.html
  */
 class CkSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/ClSubdivisionCode.php b/library/Rules/SubdivisionCode/ClSubdivisionCode.php
index b8c85b10..4a0a7615 100644
--- a/library/Rules/SubdivisionCode/ClSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/ClSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: CL
  *
- * @link http://www.geonames.org/CL/administrative-division-chile.html
+ * @see http://www.geonames.org/CL/administrative-division-chile.html
  */
 class ClSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/CmSubdivisionCode.php b/library/Rules/SubdivisionCode/CmSubdivisionCode.php
index b20169a2..9dd513e2 100644
--- a/library/Rules/SubdivisionCode/CmSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/CmSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: CM
  *
- * @link http://www.geonames.org/CM/administrative-division-cameroon.html
+ * @see http://www.geonames.org/CM/administrative-division-cameroon.html
  */
 class CmSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/CnSubdivisionCode.php b/library/Rules/SubdivisionCode/CnSubdivisionCode.php
index 723c4e8c..5c16c474 100644
--- a/library/Rules/SubdivisionCode/CnSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/CnSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: CN
  *
- * @link http://www.geonames.org/CN/administrative-division-china.html
+ * @see http://www.geonames.org/CN/administrative-division-china.html
  */
 class CnSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/CoSubdivisionCode.php b/library/Rules/SubdivisionCode/CoSubdivisionCode.php
index 3577ee4f..fcc7de2e 100644
--- a/library/Rules/SubdivisionCode/CoSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/CoSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: CO
  *
- * @link http://www.geonames.org/CO/administrative-division-colombia.html
+ * @see http://www.geonames.org/CO/administrative-division-colombia.html
  */
 class CoSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/CrSubdivisionCode.php b/library/Rules/SubdivisionCode/CrSubdivisionCode.php
index 0fad16d5..af31215b 100644
--- a/library/Rules/SubdivisionCode/CrSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/CrSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: CR
  *
- * @link http://www.geonames.org/CR/administrative-division-costa-rica.html
+ * @see http://www.geonames.org/CR/administrative-division-costa-rica.html
  */
 class CrSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/CsSubdivisionCode.php b/library/Rules/SubdivisionCode/CsSubdivisionCode.php
index 24d7eaa5..a7579bc1 100644
--- a/library/Rules/SubdivisionCode/CsSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/CsSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: CS
  *
- * @link http://www.geonames.org/CS/administrative-division-serbia-and-montenegro.html
+ * @see http://www.geonames.org/CS/administrative-division-serbia-and-montenegro.html
  */
 class CsSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/CuSubdivisionCode.php b/library/Rules/SubdivisionCode/CuSubdivisionCode.php
index 84ac1a27..ba19a219 100644
--- a/library/Rules/SubdivisionCode/CuSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/CuSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: CU
  *
- * @link http://www.geonames.org/CU/administrative-division-cuba.html
+ * @see http://www.geonames.org/CU/administrative-division-cuba.html
  */
 class CuSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/CvSubdivisionCode.php b/library/Rules/SubdivisionCode/CvSubdivisionCode.php
index e071f03c..a04cd474 100644
--- a/library/Rules/SubdivisionCode/CvSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/CvSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: CV
  *
- * @link http://www.geonames.org/CV/administrative-division-cape-verde.html
+ * @see http://www.geonames.org/CV/administrative-division-cape-verde.html
  */
 class CvSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/CwSubdivisionCode.php b/library/Rules/SubdivisionCode/CwSubdivisionCode.php
index 883a0832..e274e478 100644
--- a/library/Rules/SubdivisionCode/CwSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/CwSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: CW
  *
- * @link http://www.geonames.org/CW/administrative-division-curacao.html
+ * @see http://www.geonames.org/CW/administrative-division-curacao.html
  */
 class CwSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/CxSubdivisionCode.php b/library/Rules/SubdivisionCode/CxSubdivisionCode.php
index d1536e29..58ae6ff2 100644
--- a/library/Rules/SubdivisionCode/CxSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/CxSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: CX
  *
- * @link http://www.geonames.org/CX/administrative-division-christmas-island.html
+ * @see http://www.geonames.org/CX/administrative-division-christmas-island.html
  */
 class CxSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/CySubdivisionCode.php b/library/Rules/SubdivisionCode/CySubdivisionCode.php
index 679a8fac..e1c4112e 100644
--- a/library/Rules/SubdivisionCode/CySubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/CySubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: CY
  *
- * @link http://www.geonames.org/CY/administrative-division-cyprus.html
+ * @see http://www.geonames.org/CY/administrative-division-cyprus.html
  */
 class CySubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/CzSubdivisionCode.php b/library/Rules/SubdivisionCode/CzSubdivisionCode.php
index b7d9abcb..8ce8050e 100644
--- a/library/Rules/SubdivisionCode/CzSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/CzSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: CZ
  *
- * @link http://www.geonames.org/CZ/administrative-division-czech-republic.html
+ * @see http://www.geonames.org/CZ/administrative-division-czech-republic.html
  */
 class CzSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/DeSubdivisionCode.php b/library/Rules/SubdivisionCode/DeSubdivisionCode.php
index f800ad9e..33e40ccd 100644
--- a/library/Rules/SubdivisionCode/DeSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/DeSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: DE
  *
- * @link http://www.geonames.org/DE/administrative-division-germany.html
+ * @see http://www.geonames.org/DE/administrative-division-germany.html
  */
 class DeSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/DjSubdivisionCode.php b/library/Rules/SubdivisionCode/DjSubdivisionCode.php
index 6d489fd7..ce44e985 100644
--- a/library/Rules/SubdivisionCode/DjSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/DjSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: DJ
  *
- * @link http://www.geonames.org/DJ/administrative-division-djibouti.html
+ * @see http://www.geonames.org/DJ/administrative-division-djibouti.html
  */
 class DjSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/DkSubdivisionCode.php b/library/Rules/SubdivisionCode/DkSubdivisionCode.php
index 0a1fd377..dbfbc392 100644
--- a/library/Rules/SubdivisionCode/DkSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/DkSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: DK
  *
- * @link http://www.geonames.org/DK/administrative-division-denmark.html
+ * @see http://www.geonames.org/DK/administrative-division-denmark.html
  */
 class DkSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/DmSubdivisionCode.php b/library/Rules/SubdivisionCode/DmSubdivisionCode.php
index df4ca22b..e8787f14 100644
--- a/library/Rules/SubdivisionCode/DmSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/DmSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: DM
  *
- * @link http://www.geonames.org/DM/administrative-division-dominica.html
+ * @see http://www.geonames.org/DM/administrative-division-dominica.html
  */
 class DmSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/DoSubdivisionCode.php b/library/Rules/SubdivisionCode/DoSubdivisionCode.php
index a33c4b8c..2695f44d 100644
--- a/library/Rules/SubdivisionCode/DoSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/DoSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: DO
  *
- * @link http://www.geonames.org/DO/administrative-division-dominican-republic.html
+ * @see http://www.geonames.org/DO/administrative-division-dominican-republic.html
  */
 class DoSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/DzSubdivisionCode.php b/library/Rules/SubdivisionCode/DzSubdivisionCode.php
index 2d5d9f88..494f780d 100644
--- a/library/Rules/SubdivisionCode/DzSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/DzSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: DZ
  *
- * @link http://www.geonames.org/DZ/administrative-division-algeria.html
+ * @see http://www.geonames.org/DZ/administrative-division-algeria.html
  */
 class DzSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/EcSubdivisionCode.php b/library/Rules/SubdivisionCode/EcSubdivisionCode.php
index b38a65cc..8172f4a9 100644
--- a/library/Rules/SubdivisionCode/EcSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/EcSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: EC
  *
- * @link http://www.geonames.org/EC/administrative-division-ecuador.html
+ * @see http://www.geonames.org/EC/administrative-division-ecuador.html
  */
 class EcSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/EeSubdivisionCode.php b/library/Rules/SubdivisionCode/EeSubdivisionCode.php
index 1e4177db..3af50def 100644
--- a/library/Rules/SubdivisionCode/EeSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/EeSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: EE
  *
- * @link http://www.geonames.org/EE/administrative-division-estonia.html
+ * @see http://www.geonames.org/EE/administrative-division-estonia.html
  */
 class EeSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/EgSubdivisionCode.php b/library/Rules/SubdivisionCode/EgSubdivisionCode.php
index d3be3478..cc6d04b1 100644
--- a/library/Rules/SubdivisionCode/EgSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/EgSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: EG
  *
- * @link http://www.geonames.org/EG/administrative-division-egypt.html
+ * @see http://www.geonames.org/EG/administrative-division-egypt.html
  */
 class EgSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/EhSubdivisionCode.php b/library/Rules/SubdivisionCode/EhSubdivisionCode.php
index fb0f7cd7..607848be 100644
--- a/library/Rules/SubdivisionCode/EhSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/EhSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: EH
  *
- * @link http://www.geonames.org/EH/administrative-division-western-sahara.html
+ * @see http://www.geonames.org/EH/administrative-division-western-sahara.html
  */
 class EhSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/ErSubdivisionCode.php b/library/Rules/SubdivisionCode/ErSubdivisionCode.php
index 20a5b952..25922ef6 100644
--- a/library/Rules/SubdivisionCode/ErSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/ErSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: ER
  *
- * @link http://www.geonames.org/ER/administrative-division-eritrea.html
+ * @see http://www.geonames.org/ER/administrative-division-eritrea.html
  */
 class ErSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/EsSubdivisionCode.php b/library/Rules/SubdivisionCode/EsSubdivisionCode.php
index b6ec7d6d..32ac9ee7 100644
--- a/library/Rules/SubdivisionCode/EsSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/EsSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: ES
  *
- * @link http://www.geonames.org/ES/administrative-division-spain.html
+ * @see http://www.geonames.org/ES/administrative-division-spain.html
  */
 class EsSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/EtSubdivisionCode.php b/library/Rules/SubdivisionCode/EtSubdivisionCode.php
index e8679677..31addb07 100644
--- a/library/Rules/SubdivisionCode/EtSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/EtSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: ET
  *
- * @link http://www.geonames.org/ET/administrative-division-ethiopia.html
+ * @see http://www.geonames.org/ET/administrative-division-ethiopia.html
  */
 class EtSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/FiSubdivisionCode.php b/library/Rules/SubdivisionCode/FiSubdivisionCode.php
index f4834d46..91b7176a 100644
--- a/library/Rules/SubdivisionCode/FiSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/FiSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: FI
  *
- * @link http://www.geonames.org/FI/administrative-division-finland.html
+ * @see http://www.geonames.org/FI/administrative-division-finland.html
  */
 class FiSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/FjSubdivisionCode.php b/library/Rules/SubdivisionCode/FjSubdivisionCode.php
index 81e4daea..230fcae0 100644
--- a/library/Rules/SubdivisionCode/FjSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/FjSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: FJ
  *
- * @link http://www.geonames.org/FJ/administrative-division-fiji.html
+ * @see http://www.geonames.org/FJ/administrative-division-fiji.html
  */
 class FjSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/FkSubdivisionCode.php b/library/Rules/SubdivisionCode/FkSubdivisionCode.php
index 4cd525d4..7e466ce7 100644
--- a/library/Rules/SubdivisionCode/FkSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/FkSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: FK
  *
- * @link http://www.geonames.org/FK/administrative-division-falkland-islands.html
+ * @see http://www.geonames.org/FK/administrative-division-falkland-islands.html
  */
 class FkSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/FmSubdivisionCode.php b/library/Rules/SubdivisionCode/FmSubdivisionCode.php
index 6bb26367..e25b70c7 100644
--- a/library/Rules/SubdivisionCode/FmSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/FmSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: FM
  *
- * @link http://www.geonames.org/FM/administrative-division-micronesia.html
+ * @see http://www.geonames.org/FM/administrative-division-micronesia.html
  */
 class FmSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/FoSubdivisionCode.php b/library/Rules/SubdivisionCode/FoSubdivisionCode.php
index 8fe6df18..dbf08343 100644
--- a/library/Rules/SubdivisionCode/FoSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/FoSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: FO
  *
- * @link http://www.geonames.org/FO/administrative-division-faroe-islands.html
+ * @see http://www.geonames.org/FO/administrative-division-faroe-islands.html
  */
 class FoSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/FrSubdivisionCode.php b/library/Rules/SubdivisionCode/FrSubdivisionCode.php
index bd71e55a..2d28a7ac 100644
--- a/library/Rules/SubdivisionCode/FrSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/FrSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: FR
  *
- * @link http://www.geonames.org/FR/administrative-division-france.html
+ * @see http://www.geonames.org/FR/administrative-division-france.html
  */
 class FrSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/GaSubdivisionCode.php b/library/Rules/SubdivisionCode/GaSubdivisionCode.php
index 9eddfc47..e513170d 100644
--- a/library/Rules/SubdivisionCode/GaSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/GaSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: GA
  *
- * @link http://www.geonames.org/GA/administrative-division-gabon.html
+ * @see http://www.geonames.org/GA/administrative-division-gabon.html
  */
 class GaSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/GbSubdivisionCode.php b/library/Rules/SubdivisionCode/GbSubdivisionCode.php
index 4d5ffacc..db29518b 100644
--- a/library/Rules/SubdivisionCode/GbSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/GbSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: GB
  *
- * @link http://www.geonames.org/GB/administrative-division-united-kingdom.html
+ * @see http://www.geonames.org/GB/administrative-division-united-kingdom.html
  */
 class GbSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/GdSubdivisionCode.php b/library/Rules/SubdivisionCode/GdSubdivisionCode.php
index e8272a81..3c798088 100644
--- a/library/Rules/SubdivisionCode/GdSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/GdSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: GD
  *
- * @link http://www.geonames.org/GD/administrative-division-grenada.html
+ * @see http://www.geonames.org/GD/administrative-division-grenada.html
  */
 class GdSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/GeSubdivisionCode.php b/library/Rules/SubdivisionCode/GeSubdivisionCode.php
index 6ab737fc..90c4b00c 100644
--- a/library/Rules/SubdivisionCode/GeSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/GeSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: GE
  *
- * @link http://www.geonames.org/GE/administrative-division-georgia.html
+ * @see http://www.geonames.org/GE/administrative-division-georgia.html
  */
 class GeSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/GfSubdivisionCode.php b/library/Rules/SubdivisionCode/GfSubdivisionCode.php
index 4e0ea666..c5445a50 100644
--- a/library/Rules/SubdivisionCode/GfSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/GfSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: GF
  *
- * @link http://www.geonames.org/GF/administrative-division-french-guiana.html
+ * @see http://www.geonames.org/GF/administrative-division-french-guiana.html
  */
 class GfSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/GgSubdivisionCode.php b/library/Rules/SubdivisionCode/GgSubdivisionCode.php
index 5d9e8d5c..190e9b91 100644
--- a/library/Rules/SubdivisionCode/GgSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/GgSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: GG
  *
- * @link http://www.geonames.org/GG/administrative-division-guernsey.html
+ * @see http://www.geonames.org/GG/administrative-division-guernsey.html
  */
 class GgSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/GhSubdivisionCode.php b/library/Rules/SubdivisionCode/GhSubdivisionCode.php
index d6a06d88..6655260c 100644
--- a/library/Rules/SubdivisionCode/GhSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/GhSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: GH
  *
- * @link http://www.geonames.org/GH/administrative-division-ghana.html
+ * @see http://www.geonames.org/GH/administrative-division-ghana.html
  */
 class GhSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/GiSubdivisionCode.php b/library/Rules/SubdivisionCode/GiSubdivisionCode.php
index 5d7d877c..8f56edc2 100644
--- a/library/Rules/SubdivisionCode/GiSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/GiSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: GI
  *
- * @link http://www.geonames.org/GI/administrative-division-gibraltar.html
+ * @see http://www.geonames.org/GI/administrative-division-gibraltar.html
  */
 class GiSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/GlSubdivisionCode.php b/library/Rules/SubdivisionCode/GlSubdivisionCode.php
index 71f96585..17d71f21 100644
--- a/library/Rules/SubdivisionCode/GlSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/GlSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: GL
  *
- * @link http://www.geonames.org/GL/administrative-division-greenland.html
+ * @see http://www.geonames.org/GL/administrative-division-greenland.html
  */
 class GlSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/GmSubdivisionCode.php b/library/Rules/SubdivisionCode/GmSubdivisionCode.php
index 318959e9..f26e0eef 100644
--- a/library/Rules/SubdivisionCode/GmSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/GmSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: GM
  *
- * @link http://www.geonames.org/GM/administrative-division-gambia.html
+ * @see http://www.geonames.org/GM/administrative-division-gambia.html
  */
 class GmSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/GnSubdivisionCode.php b/library/Rules/SubdivisionCode/GnSubdivisionCode.php
index f223c14c..9198c0af 100644
--- a/library/Rules/SubdivisionCode/GnSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/GnSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: GN
  *
- * @link http://www.geonames.org/GN/administrative-division-guinea.html
+ * @see http://www.geonames.org/GN/administrative-division-guinea.html
  */
 class GnSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/GpSubdivisionCode.php b/library/Rules/SubdivisionCode/GpSubdivisionCode.php
index 16c15e00..67defacc 100644
--- a/library/Rules/SubdivisionCode/GpSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/GpSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: GP
  *
- * @link http://www.geonames.org/GP/administrative-division-guadeloupe.html
+ * @see http://www.geonames.org/GP/administrative-division-guadeloupe.html
  */
 class GpSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/GqSubdivisionCode.php b/library/Rules/SubdivisionCode/GqSubdivisionCode.php
index 191f8411..409314f4 100644
--- a/library/Rules/SubdivisionCode/GqSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/GqSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: GQ
  *
- * @link http://www.geonames.org/GQ/administrative-division-equatorial-guinea.html
+ * @see http://www.geonames.org/GQ/administrative-division-equatorial-guinea.html
  */
 class GqSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/GrSubdivisionCode.php b/library/Rules/SubdivisionCode/GrSubdivisionCode.php
index 8ddb1c29..d61c8eac 100644
--- a/library/Rules/SubdivisionCode/GrSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/GrSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: GR
  *
- * @link http://www.geonames.org/GR/administrative-division-greece.html
+ * @see http://www.geonames.org/GR/administrative-division-greece.html
  */
 class GrSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/GsSubdivisionCode.php b/library/Rules/SubdivisionCode/GsSubdivisionCode.php
index d2f4c68f..314fd0ad 100644
--- a/library/Rules/SubdivisionCode/GsSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/GsSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: GS
  *
- * @link http://www.geonames.org/GS/administrative-division-south-georgia-and-the-south-sandwich-islands.html
+ * @see http://www.geonames.org/GS/administrative-division-south-georgia-and-the-south-sandwich-islands.html
  */
 class GsSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/GtSubdivisionCode.php b/library/Rules/SubdivisionCode/GtSubdivisionCode.php
index 1507027a..3edcd650 100644
--- a/library/Rules/SubdivisionCode/GtSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/GtSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: GT
  *
- * @link http://www.geonames.org/GT/administrative-division-guatemala.html
+ * @see http://www.geonames.org/GT/administrative-division-guatemala.html
  */
 class GtSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/GuSubdivisionCode.php b/library/Rules/SubdivisionCode/GuSubdivisionCode.php
index ecf777e1..e06db47d 100644
--- a/library/Rules/SubdivisionCode/GuSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/GuSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: GU
  *
- * @link http://www.geonames.org/GU/administrative-division-guam.html
+ * @see http://www.geonames.org/GU/administrative-division-guam.html
  */
 class GuSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/GwSubdivisionCode.php b/library/Rules/SubdivisionCode/GwSubdivisionCode.php
index 52832466..225e84e5 100644
--- a/library/Rules/SubdivisionCode/GwSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/GwSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: GW
  *
- * @link http://www.geonames.org/GW/administrative-division-guinea-bissau.html
+ * @see http://www.geonames.org/GW/administrative-division-guinea-bissau.html
  */
 class GwSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/GySubdivisionCode.php b/library/Rules/SubdivisionCode/GySubdivisionCode.php
index 2ce6929f..c38774f2 100644
--- a/library/Rules/SubdivisionCode/GySubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/GySubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: GY
  *
- * @link http://www.geonames.org/GY/administrative-division-guyana.html
+ * @see http://www.geonames.org/GY/administrative-division-guyana.html
  */
 class GySubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/HkSubdivisionCode.php b/library/Rules/SubdivisionCode/HkSubdivisionCode.php
index 41830d4c..58ebc990 100644
--- a/library/Rules/SubdivisionCode/HkSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/HkSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: HK
  *
- * @link http://www.geonames.org/HK/administrative-division-hong-kong.html
+ * @see http://www.geonames.org/HK/administrative-division-hong-kong.html
  */
 class HkSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/HmSubdivisionCode.php b/library/Rules/SubdivisionCode/HmSubdivisionCode.php
index d29c7e16..63b4401f 100644
--- a/library/Rules/SubdivisionCode/HmSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/HmSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: HM
  *
- * @link http://www.geonames.org/HM/administrative-division-heard-island-and-mcdonald-islands.html
+ * @see http://www.geonames.org/HM/administrative-division-heard-island-and-mcdonald-islands.html
  */
 class HmSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/HnSubdivisionCode.php b/library/Rules/SubdivisionCode/HnSubdivisionCode.php
index d714a493..b3303e3a 100644
--- a/library/Rules/SubdivisionCode/HnSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/HnSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: HN
  *
- * @link http://www.geonames.org/HN/administrative-division-honduras.html
+ * @see http://www.geonames.org/HN/administrative-division-honduras.html
  */
 class HnSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/HrSubdivisionCode.php b/library/Rules/SubdivisionCode/HrSubdivisionCode.php
index 884768ac..4177a5ff 100644
--- a/library/Rules/SubdivisionCode/HrSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/HrSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: HR
  *
- * @link http://www.geonames.org/HR/administrative-division-croatia.html
+ * @see http://www.geonames.org/HR/administrative-division-croatia.html
  */
 class HrSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/HtSubdivisionCode.php b/library/Rules/SubdivisionCode/HtSubdivisionCode.php
index 8ab7fe73..7202a76e 100644
--- a/library/Rules/SubdivisionCode/HtSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/HtSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: HT
  *
- * @link http://www.geonames.org/HT/administrative-division-haiti.html
+ * @see http://www.geonames.org/HT/administrative-division-haiti.html
  */
 class HtSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/HuSubdivisionCode.php b/library/Rules/SubdivisionCode/HuSubdivisionCode.php
index d050f8a7..e891446c 100644
--- a/library/Rules/SubdivisionCode/HuSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/HuSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: HU
  *
- * @link http://www.geonames.org/HU/administrative-division-hungary.html
+ * @see http://www.geonames.org/HU/administrative-division-hungary.html
  */
 class HuSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/IdSubdivisionCode.php b/library/Rules/SubdivisionCode/IdSubdivisionCode.php
index fb4abeea..f860a338 100644
--- a/library/Rules/SubdivisionCode/IdSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/IdSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: ID
  *
- * @link http://www.geonames.org/ID/administrative-division-indonesia.html
+ * @see http://www.geonames.org/ID/administrative-division-indonesia.html
  */
 class IdSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/IeSubdivisionCode.php b/library/Rules/SubdivisionCode/IeSubdivisionCode.php
index 948936ea..8d710f69 100644
--- a/library/Rules/SubdivisionCode/IeSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/IeSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: IE
  *
- * @link http://www.geonames.org/IE/administrative-division-ireland.html
+ * @see http://www.geonames.org/IE/administrative-division-ireland.html
  */
 class IeSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/IlSubdivisionCode.php b/library/Rules/SubdivisionCode/IlSubdivisionCode.php
index 4728f948..965424d0 100644
--- a/library/Rules/SubdivisionCode/IlSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/IlSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: IL
  *
- * @link http://www.geonames.org/IL/administrative-division-israel.html
+ * @see http://www.geonames.org/IL/administrative-division-israel.html
  */
 class IlSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/ImSubdivisionCode.php b/library/Rules/SubdivisionCode/ImSubdivisionCode.php
index 1530f887..b717bb69 100644
--- a/library/Rules/SubdivisionCode/ImSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/ImSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: IM
  *
- * @link http://www.geonames.org/IM/administrative-division-isle-of-man.html
+ * @see http://www.geonames.org/IM/administrative-division-isle-of-man.html
  */
 class ImSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/InSubdivisionCode.php b/library/Rules/SubdivisionCode/InSubdivisionCode.php
index c7d6b129..6fd8d482 100644
--- a/library/Rules/SubdivisionCode/InSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/InSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: IN
  *
- * @link http://www.geonames.org/IN/administrative-division-india.html
+ * @see http://www.geonames.org/IN/administrative-division-india.html
  */
 class InSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/IoSubdivisionCode.php b/library/Rules/SubdivisionCode/IoSubdivisionCode.php
index 2530c4dd..441e0a5a 100644
--- a/library/Rules/SubdivisionCode/IoSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/IoSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: IO
  *
- * @link http://www.geonames.org/IO/administrative-division-british-indian-ocean-territory.html
+ * @see http://www.geonames.org/IO/administrative-division-british-indian-ocean-territory.html
  */
 class IoSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/IqSubdivisionCode.php b/library/Rules/SubdivisionCode/IqSubdivisionCode.php
index fb09bf61..ebc1fdd6 100644
--- a/library/Rules/SubdivisionCode/IqSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/IqSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: IQ
  *
- * @link http://www.geonames.org/IQ/administrative-division-iraq.html
+ * @see http://www.geonames.org/IQ/administrative-division-iraq.html
  */
 class IqSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/IrSubdivisionCode.php b/library/Rules/SubdivisionCode/IrSubdivisionCode.php
index ded2a41a..6b3ab80f 100644
--- a/library/Rules/SubdivisionCode/IrSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/IrSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: IR
  *
- * @link http://www.geonames.org/IR/administrative-division-iran.html
+ * @see http://www.geonames.org/IR/administrative-division-iran.html
  */
 class IrSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/IsSubdivisionCode.php b/library/Rules/SubdivisionCode/IsSubdivisionCode.php
index 7c736c0b..20644452 100644
--- a/library/Rules/SubdivisionCode/IsSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/IsSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: IS
  *
- * @link http://www.geonames.org/IS/administrative-division-iceland.html
+ * @see http://www.geonames.org/IS/administrative-division-iceland.html
  */
 class IsSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/ItSubdivisionCode.php b/library/Rules/SubdivisionCode/ItSubdivisionCode.php
index fa624a5f..22a1ab43 100644
--- a/library/Rules/SubdivisionCode/ItSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/ItSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: IT
  *
- * @link http://www.geonames.org/IT/administrative-division-italy.html
+ * @see http://www.geonames.org/IT/administrative-division-italy.html
  */
 class ItSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/JeSubdivisionCode.php b/library/Rules/SubdivisionCode/JeSubdivisionCode.php
index a18d79cf..faf8d1ad 100644
--- a/library/Rules/SubdivisionCode/JeSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/JeSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: JE
  *
- * @link http://www.geonames.org/JE/administrative-division-jersey.html
+ * @see http://www.geonames.org/JE/administrative-division-jersey.html
  */
 class JeSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/JmSubdivisionCode.php b/library/Rules/SubdivisionCode/JmSubdivisionCode.php
index 806e54ab..8b72184f 100644
--- a/library/Rules/SubdivisionCode/JmSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/JmSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: JM
  *
- * @link http://www.geonames.org/JM/administrative-division-jamaica.html
+ * @see http://www.geonames.org/JM/administrative-division-jamaica.html
  */
 class JmSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/JoSubdivisionCode.php b/library/Rules/SubdivisionCode/JoSubdivisionCode.php
index 76147cfb..e5818c46 100644
--- a/library/Rules/SubdivisionCode/JoSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/JoSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: JO
  *
- * @link http://www.geonames.org/JO/administrative-division-jordan.html
+ * @see http://www.geonames.org/JO/administrative-division-jordan.html
  */
 class JoSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/JpSubdivisionCode.php b/library/Rules/SubdivisionCode/JpSubdivisionCode.php
index 75c65629..fa374ebb 100644
--- a/library/Rules/SubdivisionCode/JpSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/JpSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: JP
  *
- * @link http://www.geonames.org/JP/administrative-division-japan.html
+ * @see http://www.geonames.org/JP/administrative-division-japan.html
  */
 class JpSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/KeSubdivisionCode.php b/library/Rules/SubdivisionCode/KeSubdivisionCode.php
index 2f602ca9..c7562b62 100644
--- a/library/Rules/SubdivisionCode/KeSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/KeSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: KE
  *
- * @link http://www.geonames.org/KE/administrative-division-kenya.html
+ * @see http://www.geonames.org/KE/administrative-division-kenya.html
  */
 class KeSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/KgSubdivisionCode.php b/library/Rules/SubdivisionCode/KgSubdivisionCode.php
index aaf78704..a1f3f74a 100644
--- a/library/Rules/SubdivisionCode/KgSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/KgSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: KG
  *
- * @link http://www.geonames.org/KG/administrative-division-kyrgyzstan.html
+ * @see http://www.geonames.org/KG/administrative-division-kyrgyzstan.html
  */
 class KgSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/KhSubdivisionCode.php b/library/Rules/SubdivisionCode/KhSubdivisionCode.php
index ff7beabf..412a5a2e 100644
--- a/library/Rules/SubdivisionCode/KhSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/KhSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: KH
  *
- * @link http://www.geonames.org/KH/administrative-division-cambodia.html
+ * @see http://www.geonames.org/KH/administrative-division-cambodia.html
  */
 class KhSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/KiSubdivisionCode.php b/library/Rules/SubdivisionCode/KiSubdivisionCode.php
index 85fe0dd5..34356e88 100644
--- a/library/Rules/SubdivisionCode/KiSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/KiSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: KI
  *
- * @link http://www.geonames.org/KI/administrative-division-kiribati.html
+ * @see http://www.geonames.org/KI/administrative-division-kiribati.html
  */
 class KiSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/KmSubdivisionCode.php b/library/Rules/SubdivisionCode/KmSubdivisionCode.php
index f3303aff..a7bd8d2c 100644
--- a/library/Rules/SubdivisionCode/KmSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/KmSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: KM
  *
- * @link http://www.geonames.org/KM/administrative-division-comoros.html
+ * @see http://www.geonames.org/KM/administrative-division-comoros.html
  */
 class KmSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/KnSubdivisionCode.php b/library/Rules/SubdivisionCode/KnSubdivisionCode.php
index 7722f0d3..9fe3e47a 100644
--- a/library/Rules/SubdivisionCode/KnSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/KnSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: KN
  *
- * @link http://www.geonames.org/KN/administrative-division-saint-kitts-and-nevis.html
+ * @see http://www.geonames.org/KN/administrative-division-saint-kitts-and-nevis.html
  */
 class KnSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/KpSubdivisionCode.php b/library/Rules/SubdivisionCode/KpSubdivisionCode.php
index 0338b902..4d5cdd78 100644
--- a/library/Rules/SubdivisionCode/KpSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/KpSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: KP
  *
- * @link http://www.geonames.org/KP/administrative-division-north-korea.html
+ * @see http://www.geonames.org/KP/administrative-division-north-korea.html
  */
 class KpSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/KrSubdivisionCode.php b/library/Rules/SubdivisionCode/KrSubdivisionCode.php
index 6bea3cd2..607f3eeb 100644
--- a/library/Rules/SubdivisionCode/KrSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/KrSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: KR
  *
- * @link http://www.geonames.org/KR/administrative-division-south-korea.html
+ * @see http://www.geonames.org/KR/administrative-division-south-korea.html
  */
 class KrSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/KwSubdivisionCode.php b/library/Rules/SubdivisionCode/KwSubdivisionCode.php
index cd68bb91..f2fe06b8 100644
--- a/library/Rules/SubdivisionCode/KwSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/KwSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: KW
  *
- * @link http://www.geonames.org/KW/administrative-division-kuwait.html
+ * @see http://www.geonames.org/KW/administrative-division-kuwait.html
  */
 class KwSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/KySubdivisionCode.php b/library/Rules/SubdivisionCode/KySubdivisionCode.php
index 05042848..cc149251 100644
--- a/library/Rules/SubdivisionCode/KySubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/KySubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: KY
  *
- * @link http://www.geonames.org/KY/administrative-division-cayman-islands.html
+ * @see http://www.geonames.org/KY/administrative-division-cayman-islands.html
  */
 class KySubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/KzSubdivisionCode.php b/library/Rules/SubdivisionCode/KzSubdivisionCode.php
index 6f1daacc..e983f968 100644
--- a/library/Rules/SubdivisionCode/KzSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/KzSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: KZ
  *
- * @link http://www.geonames.org/KZ/administrative-division-kazakhstan.html
+ * @see http://www.geonames.org/KZ/administrative-division-kazakhstan.html
  */
 class KzSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/LaSubdivisionCode.php b/library/Rules/SubdivisionCode/LaSubdivisionCode.php
index 5b7427a3..b5aa4211 100644
--- a/library/Rules/SubdivisionCode/LaSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/LaSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: LA
  *
- * @link http://www.geonames.org/LA/administrative-division-laos.html
+ * @see http://www.geonames.org/LA/administrative-division-laos.html
  */
 class LaSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/LbSubdivisionCode.php b/library/Rules/SubdivisionCode/LbSubdivisionCode.php
index 59cc3c4b..989509c0 100644
--- a/library/Rules/SubdivisionCode/LbSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/LbSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: LB
  *
- * @link http://www.geonames.org/LB/administrative-division-lebanon.html
+ * @see http://www.geonames.org/LB/administrative-division-lebanon.html
  */
 class LbSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/LcSubdivisionCode.php b/library/Rules/SubdivisionCode/LcSubdivisionCode.php
index 75c6a270..159085f0 100644
--- a/library/Rules/SubdivisionCode/LcSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/LcSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: LC
  *
- * @link http://www.geonames.org/LC/administrative-division-saint-lucia.html
+ * @see http://www.geonames.org/LC/administrative-division-saint-lucia.html
  */
 class LcSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/LiSubdivisionCode.php b/library/Rules/SubdivisionCode/LiSubdivisionCode.php
index b8109914..7eb23d7f 100644
--- a/library/Rules/SubdivisionCode/LiSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/LiSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: LI
  *
- * @link http://www.geonames.org/LI/administrative-division-liechtenstein.html
+ * @see http://www.geonames.org/LI/administrative-division-liechtenstein.html
  */
 class LiSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/LkSubdivisionCode.php b/library/Rules/SubdivisionCode/LkSubdivisionCode.php
index 1ee0a616..ca869ed6 100644
--- a/library/Rules/SubdivisionCode/LkSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/LkSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: LK
  *
- * @link http://www.geonames.org/LK/administrative-division-sri-lanka.html
+ * @see http://www.geonames.org/LK/administrative-division-sri-lanka.html
  */
 class LkSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/LrSubdivisionCode.php b/library/Rules/SubdivisionCode/LrSubdivisionCode.php
index 73052ad3..38319a65 100644
--- a/library/Rules/SubdivisionCode/LrSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/LrSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: LR
  *
- * @link http://www.geonames.org/LR/administrative-division-liberia.html
+ * @see http://www.geonames.org/LR/administrative-division-liberia.html
  */
 class LrSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/LsSubdivisionCode.php b/library/Rules/SubdivisionCode/LsSubdivisionCode.php
index 23f5a2af..ef5eb243 100644
--- a/library/Rules/SubdivisionCode/LsSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/LsSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: LS
  *
- * @link http://www.geonames.org/LS/administrative-division-lesotho.html
+ * @see http://www.geonames.org/LS/administrative-division-lesotho.html
  */
 class LsSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/LtSubdivisionCode.php b/library/Rules/SubdivisionCode/LtSubdivisionCode.php
index effd3807..9ba20225 100644
--- a/library/Rules/SubdivisionCode/LtSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/LtSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: LT
  *
- * @link http://www.geonames.org/LT/administrative-division-lithuania.html
+ * @see http://www.geonames.org/LT/administrative-division-lithuania.html
  */
 class LtSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/LuSubdivisionCode.php b/library/Rules/SubdivisionCode/LuSubdivisionCode.php
index ecf56a25..fbae22a8 100644
--- a/library/Rules/SubdivisionCode/LuSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/LuSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: LU
  *
- * @link http://www.geonames.org/LU/administrative-division-luxembourg.html
+ * @see http://www.geonames.org/LU/administrative-division-luxembourg.html
  */
 class LuSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/LvSubdivisionCode.php b/library/Rules/SubdivisionCode/LvSubdivisionCode.php
index 16b413c0..0e9c4eaa 100644
--- a/library/Rules/SubdivisionCode/LvSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/LvSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: LV
  *
- * @link http://www.geonames.org/LV/administrative-division-latvia.html
+ * @see http://www.geonames.org/LV/administrative-division-latvia.html
  */
 class LvSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/LySubdivisionCode.php b/library/Rules/SubdivisionCode/LySubdivisionCode.php
index ab5951dd..4f0debd5 100644
--- a/library/Rules/SubdivisionCode/LySubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/LySubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: LY
  *
- * @link http://www.geonames.org/LY/administrative-division-libya.html
+ * @see http://www.geonames.org/LY/administrative-division-libya.html
  */
 class LySubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/MaSubdivisionCode.php b/library/Rules/SubdivisionCode/MaSubdivisionCode.php
index bae957f5..f854532f 100644
--- a/library/Rules/SubdivisionCode/MaSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/MaSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: MA
  *
- * @link http://www.geonames.org/MA/administrative-division-morocco.html
+ * @see http://www.geonames.org/MA/administrative-division-morocco.html
  */
 class MaSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/McSubdivisionCode.php b/library/Rules/SubdivisionCode/McSubdivisionCode.php
index 98ae794a..a41c8c5c 100644
--- a/library/Rules/SubdivisionCode/McSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/McSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: MC
  *
- * @link http://www.geonames.org/MC/administrative-division-monaco.html
+ * @see http://www.geonames.org/MC/administrative-division-monaco.html
  */
 class McSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/MdSubdivisionCode.php b/library/Rules/SubdivisionCode/MdSubdivisionCode.php
index 8bb28f1b..b869f156 100644
--- a/library/Rules/SubdivisionCode/MdSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/MdSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: MD
  *
- * @link http://www.geonames.org/MD/administrative-division-moldova.html
+ * @see http://www.geonames.org/MD/administrative-division-moldova.html
  */
 class MdSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/MeSubdivisionCode.php b/library/Rules/SubdivisionCode/MeSubdivisionCode.php
index f9eb5afd..8451df26 100644
--- a/library/Rules/SubdivisionCode/MeSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/MeSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: ME
  *
- * @link http://www.geonames.org/ME/administrative-division-montenegro.html
+ * @see http://www.geonames.org/ME/administrative-division-montenegro.html
  */
 class MeSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/MfSubdivisionCode.php b/library/Rules/SubdivisionCode/MfSubdivisionCode.php
index af014edf..c3bf2056 100644
--- a/library/Rules/SubdivisionCode/MfSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/MfSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: MF
  *
- * @link http://www.geonames.org/MF/administrative-division-saint-martin.html
+ * @see http://www.geonames.org/MF/administrative-division-saint-martin.html
  */
 class MfSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/MgSubdivisionCode.php b/library/Rules/SubdivisionCode/MgSubdivisionCode.php
index 323ef623..c5c6b0f7 100644
--- a/library/Rules/SubdivisionCode/MgSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/MgSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: MG
  *
- * @link http://www.geonames.org/MG/administrative-division-madagascar.html
+ * @see http://www.geonames.org/MG/administrative-division-madagascar.html
  */
 class MgSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/MhSubdivisionCode.php b/library/Rules/SubdivisionCode/MhSubdivisionCode.php
index 7dfe27b5..c6db2733 100644
--- a/library/Rules/SubdivisionCode/MhSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/MhSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: MH
  *
- * @link http://www.geonames.org/MH/administrative-division-marshall-islands.html
+ * @see http://www.geonames.org/MH/administrative-division-marshall-islands.html
  */
 class MhSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/MkSubdivisionCode.php b/library/Rules/SubdivisionCode/MkSubdivisionCode.php
index b5274579..078b3a41 100644
--- a/library/Rules/SubdivisionCode/MkSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/MkSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: MK
  *
- * @link http://www.geonames.org/MK/administrative-division-macedonia.html
+ * @see http://www.geonames.org/MK/administrative-division-macedonia.html
  */
 class MkSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/MlSubdivisionCode.php b/library/Rules/SubdivisionCode/MlSubdivisionCode.php
index 598ec4f5..54389d70 100644
--- a/library/Rules/SubdivisionCode/MlSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/MlSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: ML
  *
- * @link http://www.geonames.org/ML/administrative-division-mali.html
+ * @see http://www.geonames.org/ML/administrative-division-mali.html
  */
 class MlSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/MmSubdivisionCode.php b/library/Rules/SubdivisionCode/MmSubdivisionCode.php
index 0d728aa5..079a46df 100644
--- a/library/Rules/SubdivisionCode/MmSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/MmSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: MM
  *
- * @link http://www.geonames.org/MM/administrative-division-myanmar.html
+ * @see http://www.geonames.org/MM/administrative-division-myanmar.html
  */
 class MmSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/MnSubdivisionCode.php b/library/Rules/SubdivisionCode/MnSubdivisionCode.php
index c0cf304b..552ad3a6 100644
--- a/library/Rules/SubdivisionCode/MnSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/MnSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: MN
  *
- * @link http://www.geonames.org/MN/administrative-division-mongolia.html
+ * @see http://www.geonames.org/MN/administrative-division-mongolia.html
  */
 class MnSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/MoSubdivisionCode.php b/library/Rules/SubdivisionCode/MoSubdivisionCode.php
index 898be4e9..1bac5785 100644
--- a/library/Rules/SubdivisionCode/MoSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/MoSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: MO
  *
- * @link http://www.geonames.org/MO/administrative-division-macao.html
+ * @see http://www.geonames.org/MO/administrative-division-macao.html
  */
 class MoSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/MpSubdivisionCode.php b/library/Rules/SubdivisionCode/MpSubdivisionCode.php
index a25ea148..9406c194 100644
--- a/library/Rules/SubdivisionCode/MpSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/MpSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: MP
  *
- * @link http://www.geonames.org/MP/administrative-division-northern-mariana-islands.html
+ * @see http://www.geonames.org/MP/administrative-division-northern-mariana-islands.html
  */
 class MpSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/MqSubdivisionCode.php b/library/Rules/SubdivisionCode/MqSubdivisionCode.php
index 6ae5f098..cdeca06a 100644
--- a/library/Rules/SubdivisionCode/MqSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/MqSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: MQ
  *
- * @link http://www.geonames.org/MQ/administrative-division-martinique.html
+ * @see http://www.geonames.org/MQ/administrative-division-martinique.html
  */
 class MqSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/MrSubdivisionCode.php b/library/Rules/SubdivisionCode/MrSubdivisionCode.php
index 43c1ff3b..1bdf0b20 100644
--- a/library/Rules/SubdivisionCode/MrSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/MrSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: MR
  *
- * @link http://www.geonames.org/MR/administrative-division-mauritania.html
+ * @see http://www.geonames.org/MR/administrative-division-mauritania.html
  */
 class MrSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/MsSubdivisionCode.php b/library/Rules/SubdivisionCode/MsSubdivisionCode.php
index ec34111b..a425c84f 100644
--- a/library/Rules/SubdivisionCode/MsSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/MsSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: MS
  *
- * @link http://www.geonames.org/MS/administrative-division-montserrat.html
+ * @see http://www.geonames.org/MS/administrative-division-montserrat.html
  */
 class MsSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/MtSubdivisionCode.php b/library/Rules/SubdivisionCode/MtSubdivisionCode.php
index 75037b84..876dc6c6 100644
--- a/library/Rules/SubdivisionCode/MtSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/MtSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: MT
  *
- * @link http://www.geonames.org/MT/administrative-division-malta.html
+ * @see http://www.geonames.org/MT/administrative-division-malta.html
  */
 class MtSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/MuSubdivisionCode.php b/library/Rules/SubdivisionCode/MuSubdivisionCode.php
index 1aec7191..14621521 100644
--- a/library/Rules/SubdivisionCode/MuSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/MuSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: MU
  *
- * @link http://www.geonames.org/MU/administrative-division-mauritius.html
+ * @see http://www.geonames.org/MU/administrative-division-mauritius.html
  */
 class MuSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/MvSubdivisionCode.php b/library/Rules/SubdivisionCode/MvSubdivisionCode.php
index 5d2dc959..10f70bd3 100644
--- a/library/Rules/SubdivisionCode/MvSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/MvSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: MV
  *
- * @link http://www.geonames.org/MV/administrative-division-maldives.html
+ * @see http://www.geonames.org/MV/administrative-division-maldives.html
  */
 class MvSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/MwSubdivisionCode.php b/library/Rules/SubdivisionCode/MwSubdivisionCode.php
index 6c521b24..43673eff 100644
--- a/library/Rules/SubdivisionCode/MwSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/MwSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: MW
  *
- * @link http://www.geonames.org/MW/administrative-division-malawi.html
+ * @see http://www.geonames.org/MW/administrative-division-malawi.html
  */
 class MwSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/MxSubdivisionCode.php b/library/Rules/SubdivisionCode/MxSubdivisionCode.php
index 00ba2dd1..a3e4f4ab 100644
--- a/library/Rules/SubdivisionCode/MxSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/MxSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: MX
  *
- * @link http://www.geonames.org/MX/administrative-division-mexico.html
+ * @see http://www.geonames.org/MX/administrative-division-mexico.html
  */
 class MxSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/MySubdivisionCode.php b/library/Rules/SubdivisionCode/MySubdivisionCode.php
index e37d1d74..e0e2cae7 100644
--- a/library/Rules/SubdivisionCode/MySubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/MySubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: MY
  *
- * @link http://www.geonames.org/MY/administrative-division-malaysia.html
+ * @see http://www.geonames.org/MY/administrative-division-malaysia.html
  */
 class MySubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/MzSubdivisionCode.php b/library/Rules/SubdivisionCode/MzSubdivisionCode.php
index dfbbcefb..9e0c468a 100644
--- a/library/Rules/SubdivisionCode/MzSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/MzSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: MZ
  *
- * @link http://www.geonames.org/MZ/administrative-division-mozambique.html
+ * @see http://www.geonames.org/MZ/administrative-division-mozambique.html
  */
 class MzSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/NaSubdivisionCode.php b/library/Rules/SubdivisionCode/NaSubdivisionCode.php
index 2109fb3a..e65dfb6f 100644
--- a/library/Rules/SubdivisionCode/NaSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/NaSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: NA
  *
- * @link http://www.geonames.org/NA/administrative-division-namibia.html
+ * @see http://www.geonames.org/NA/administrative-division-namibia.html
  */
 class NaSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/NcSubdivisionCode.php b/library/Rules/SubdivisionCode/NcSubdivisionCode.php
index c52b9b7e..61eabcc5 100644
--- a/library/Rules/SubdivisionCode/NcSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/NcSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: NC
  *
- * @link http://www.geonames.org/NC/administrative-division-new-caledonia.html
+ * @see http://www.geonames.org/NC/administrative-division-new-caledonia.html
  */
 class NcSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/NeSubdivisionCode.php b/library/Rules/SubdivisionCode/NeSubdivisionCode.php
index 2186b02d..c0326d85 100644
--- a/library/Rules/SubdivisionCode/NeSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/NeSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: NE
  *
- * @link http://www.geonames.org/NE/administrative-division-niger.html
+ * @see http://www.geonames.org/NE/administrative-division-niger.html
  */
 class NeSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/NfSubdivisionCode.php b/library/Rules/SubdivisionCode/NfSubdivisionCode.php
index 67275e50..5b9f53c5 100644
--- a/library/Rules/SubdivisionCode/NfSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/NfSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: NF
  *
- * @link http://www.geonames.org/NF/administrative-division-norfolk-island.html
+ * @see http://www.geonames.org/NF/administrative-division-norfolk-island.html
  */
 class NfSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/NgSubdivisionCode.php b/library/Rules/SubdivisionCode/NgSubdivisionCode.php
index dac3b9f7..d8529846 100644
--- a/library/Rules/SubdivisionCode/NgSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/NgSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: NG
  *
- * @link http://www.geonames.org/NG/administrative-division-nigeria.html
+ * @see http://www.geonames.org/NG/administrative-division-nigeria.html
  */
 class NgSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/NiSubdivisionCode.php b/library/Rules/SubdivisionCode/NiSubdivisionCode.php
index 040c9b6b..35d8276a 100644
--- a/library/Rules/SubdivisionCode/NiSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/NiSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: NI
  *
- * @link http://www.geonames.org/NI/administrative-division-nicaragua.html
+ * @see http://www.geonames.org/NI/administrative-division-nicaragua.html
  */
 class NiSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/NlSubdivisionCode.php b/library/Rules/SubdivisionCode/NlSubdivisionCode.php
index 0979bab7..920e37c5 100644
--- a/library/Rules/SubdivisionCode/NlSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/NlSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: NL
  *
- * @link http://www.geonames.org/NL/administrative-division-netherlands.html
+ * @see http://www.geonames.org/NL/administrative-division-netherlands.html
  */
 class NlSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/NoSubdivisionCode.php b/library/Rules/SubdivisionCode/NoSubdivisionCode.php
index 1fb6bcc1..052f185c 100644
--- a/library/Rules/SubdivisionCode/NoSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/NoSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: NO
  *
- * @link http://www.geonames.org/NO/administrative-division-norway.html
+ * @see http://www.geonames.org/NO/administrative-division-norway.html
  */
 class NoSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/NpSubdivisionCode.php b/library/Rules/SubdivisionCode/NpSubdivisionCode.php
index a0519e75..c0fd8cdd 100644
--- a/library/Rules/SubdivisionCode/NpSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/NpSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: NP
  *
- * @link http://www.geonames.org/NP/administrative-division-nepal.html
+ * @see http://www.geonames.org/NP/administrative-division-nepal.html
  */
 class NpSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/NrSubdivisionCode.php b/library/Rules/SubdivisionCode/NrSubdivisionCode.php
index 652058a0..4da706f5 100644
--- a/library/Rules/SubdivisionCode/NrSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/NrSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: NR
  *
- * @link http://www.geonames.org/NR/administrative-division-nauru.html
+ * @see http://www.geonames.org/NR/administrative-division-nauru.html
  */
 class NrSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/NuSubdivisionCode.php b/library/Rules/SubdivisionCode/NuSubdivisionCode.php
index e9572150..49496898 100644
--- a/library/Rules/SubdivisionCode/NuSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/NuSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: NU
  *
- * @link http://www.geonames.org/NU/administrative-division-niue.html
+ * @see http://www.geonames.org/NU/administrative-division-niue.html
  */
 class NuSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/NzSubdivisionCode.php b/library/Rules/SubdivisionCode/NzSubdivisionCode.php
index e2207e14..becedd6f 100644
--- a/library/Rules/SubdivisionCode/NzSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/NzSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: NZ
  *
- * @link http://www.geonames.org/NZ/administrative-division-new-zealand.html
+ * @see http://www.geonames.org/NZ/administrative-division-new-zealand.html
  */
 class NzSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/OmSubdivisionCode.php b/library/Rules/SubdivisionCode/OmSubdivisionCode.php
index cc670230..4e59c065 100644
--- a/library/Rules/SubdivisionCode/OmSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/OmSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: OM
  *
- * @link http://www.geonames.org/OM/administrative-division-oman.html
+ * @see http://www.geonames.org/OM/administrative-division-oman.html
  */
 class OmSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/PaSubdivisionCode.php b/library/Rules/SubdivisionCode/PaSubdivisionCode.php
index c6f975fb..599d9c01 100644
--- a/library/Rules/SubdivisionCode/PaSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/PaSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: PA
  *
- * @link http://www.geonames.org/PA/administrative-division-panama.html
+ * @see http://www.geonames.org/PA/administrative-division-panama.html
  */
 class PaSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/PeSubdivisionCode.php b/library/Rules/SubdivisionCode/PeSubdivisionCode.php
index 6618584a..f5f1adfa 100644
--- a/library/Rules/SubdivisionCode/PeSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/PeSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: PE
  *
- * @link http://www.geonames.org/PE/administrative-division-peru.html
+ * @see http://www.geonames.org/PE/administrative-division-peru.html
  */
 class PeSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/PfSubdivisionCode.php b/library/Rules/SubdivisionCode/PfSubdivisionCode.php
index 6f8ed8f9..6e494dd4 100644
--- a/library/Rules/SubdivisionCode/PfSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/PfSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: PF
  *
- * @link http://www.geonames.org/PF/administrative-division-french-polynesia.html
+ * @see http://www.geonames.org/PF/administrative-division-french-polynesia.html
  */
 class PfSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/PgSubdivisionCode.php b/library/Rules/SubdivisionCode/PgSubdivisionCode.php
index 8263f40a..46658780 100644
--- a/library/Rules/SubdivisionCode/PgSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/PgSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: PG
  *
- * @link http://www.geonames.org/PG/administrative-division-papua-new-guinea.html
+ * @see http://www.geonames.org/PG/administrative-division-papua-new-guinea.html
  */
 class PgSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/PhSubdivisionCode.php b/library/Rules/SubdivisionCode/PhSubdivisionCode.php
index ec257233..5ed3eaf9 100644
--- a/library/Rules/SubdivisionCode/PhSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/PhSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: PH
  *
- * @link http://www.geonames.org/PH/administrative-division-philippines.html
+ * @see http://www.geonames.org/PH/administrative-division-philippines.html
  */
 class PhSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/PkSubdivisionCode.php b/library/Rules/SubdivisionCode/PkSubdivisionCode.php
index 19293abf..733f53e5 100644
--- a/library/Rules/SubdivisionCode/PkSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/PkSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: PK
  *
- * @link http://www.geonames.org/PK/administrative-division-pakistan.html
+ * @see http://www.geonames.org/PK/administrative-division-pakistan.html
  */
 class PkSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/PlSubdivisionCode.php b/library/Rules/SubdivisionCode/PlSubdivisionCode.php
index b2b0b1b6..603a8187 100644
--- a/library/Rules/SubdivisionCode/PlSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/PlSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: PL
  *
- * @link http://www.geonames.org/PL/administrative-division-poland.html
+ * @see http://www.geonames.org/PL/administrative-division-poland.html
  */
 class PlSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/PmSubdivisionCode.php b/library/Rules/SubdivisionCode/PmSubdivisionCode.php
index d5f3d427..cbf14152 100644
--- a/library/Rules/SubdivisionCode/PmSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/PmSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: PM
  *
- * @link http://www.geonames.org/PM/administrative-division-saint-pierre-and-miquelon.html
+ * @see http://www.geonames.org/PM/administrative-division-saint-pierre-and-miquelon.html
  */
 class PmSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/PnSubdivisionCode.php b/library/Rules/SubdivisionCode/PnSubdivisionCode.php
index 08365351..e731b092 100644
--- a/library/Rules/SubdivisionCode/PnSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/PnSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: PN
  *
- * @link http://www.geonames.org/PN/administrative-division-pitcairn-islands.html
+ * @see http://www.geonames.org/PN/administrative-division-pitcairn-islands.html
  */
 class PnSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/PrSubdivisionCode.php b/library/Rules/SubdivisionCode/PrSubdivisionCode.php
index c6180569..db6e0ea3 100644
--- a/library/Rules/SubdivisionCode/PrSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/PrSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: PR
  *
- * @link http://www.geonames.org/PR/administrative-division-puerto-rico.html
+ * @see http://www.geonames.org/PR/administrative-division-puerto-rico.html
  */
 class PrSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/PsSubdivisionCode.php b/library/Rules/SubdivisionCode/PsSubdivisionCode.php
index 42a7f4a1..33702ae0 100644
--- a/library/Rules/SubdivisionCode/PsSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/PsSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: PS
  *
- * @link http://www.geonames.org/PS/administrative-division-palestine.html
+ * @see http://www.geonames.org/PS/administrative-division-palestine.html
  */
 class PsSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/PtSubdivisionCode.php b/library/Rules/SubdivisionCode/PtSubdivisionCode.php
index e16e822b..ed423837 100644
--- a/library/Rules/SubdivisionCode/PtSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/PtSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: PT
  *
- * @link http://www.geonames.org/PT/administrative-division-portugal.html
+ * @see http://www.geonames.org/PT/administrative-division-portugal.html
  */
 class PtSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/PwSubdivisionCode.php b/library/Rules/SubdivisionCode/PwSubdivisionCode.php
index fd127700..6b20a98b 100644
--- a/library/Rules/SubdivisionCode/PwSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/PwSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: PW
  *
- * @link http://www.geonames.org/PW/administrative-division-palau.html
+ * @see http://www.geonames.org/PW/administrative-division-palau.html
  */
 class PwSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/PySubdivisionCode.php b/library/Rules/SubdivisionCode/PySubdivisionCode.php
index f96d92aa..2063eb5c 100644
--- a/library/Rules/SubdivisionCode/PySubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/PySubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: PY
  *
- * @link http://www.geonames.org/PY/administrative-division-paraguay.html
+ * @see http://www.geonames.org/PY/administrative-division-paraguay.html
  */
 class PySubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/QaSubdivisionCode.php b/library/Rules/SubdivisionCode/QaSubdivisionCode.php
index 22357d48..b963475d 100644
--- a/library/Rules/SubdivisionCode/QaSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/QaSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: QA
  *
- * @link http://www.geonames.org/QA/administrative-division-qatar.html
+ * @see http://www.geonames.org/QA/administrative-division-qatar.html
  */
 class QaSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/ReSubdivisionCode.php b/library/Rules/SubdivisionCode/ReSubdivisionCode.php
index df1f9a10..3bcf48f8 100644
--- a/library/Rules/SubdivisionCode/ReSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/ReSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: RE
  *
- * @link http://www.geonames.org/RE/administrative-division-reunion.html
+ * @see http://www.geonames.org/RE/administrative-division-reunion.html
  */
 class ReSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/RoSubdivisionCode.php b/library/Rules/SubdivisionCode/RoSubdivisionCode.php
index cc6865e1..4053dd40 100644
--- a/library/Rules/SubdivisionCode/RoSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/RoSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: RO
  *
- * @link http://www.geonames.org/RO/administrative-division-romania.html
+ * @see http://www.geonames.org/RO/administrative-division-romania.html
  */
 class RoSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/RsSubdivisionCode.php b/library/Rules/SubdivisionCode/RsSubdivisionCode.php
index 3b48a9ae..467c0a3d 100644
--- a/library/Rules/SubdivisionCode/RsSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/RsSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: RS
  *
- * @link http://www.geonames.org/RS/administrative-division-serbia.html
+ * @see http://www.geonames.org/RS/administrative-division-serbia.html
  */
 class RsSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/RuSubdivisionCode.php b/library/Rules/SubdivisionCode/RuSubdivisionCode.php
index c13bbe12..498303b3 100644
--- a/library/Rules/SubdivisionCode/RuSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/RuSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: RU
  *
- * @link http://www.geonames.org/RU/administrative-division-russia.html
+ * @see http://www.geonames.org/RU/administrative-division-russia.html
  */
 class RuSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/RwSubdivisionCode.php b/library/Rules/SubdivisionCode/RwSubdivisionCode.php
index 020fce73..a286c32b 100644
--- a/library/Rules/SubdivisionCode/RwSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/RwSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: RW
  *
- * @link http://www.geonames.org/RW/administrative-division-rwanda.html
+ * @see http://www.geonames.org/RW/administrative-division-rwanda.html
  */
 class RwSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/SaSubdivisionCode.php b/library/Rules/SubdivisionCode/SaSubdivisionCode.php
index 6b05f359..84cde743 100644
--- a/library/Rules/SubdivisionCode/SaSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/SaSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: SA
  *
- * @link http://www.geonames.org/SA/administrative-division-saudi-arabia.html
+ * @see http://www.geonames.org/SA/administrative-division-saudi-arabia.html
  */
 class SaSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/SbSubdivisionCode.php b/library/Rules/SubdivisionCode/SbSubdivisionCode.php
index daeaedc4..790d9998 100644
--- a/library/Rules/SubdivisionCode/SbSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/SbSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: SB
  *
- * @link http://www.geonames.org/SB/administrative-division-solomon-islands.html
+ * @see http://www.geonames.org/SB/administrative-division-solomon-islands.html
  */
 class SbSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/ScSubdivisionCode.php b/library/Rules/SubdivisionCode/ScSubdivisionCode.php
index 9f0dfe21..03b790f8 100644
--- a/library/Rules/SubdivisionCode/ScSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/ScSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: SC
  *
- * @link http://www.geonames.org/SC/administrative-division-seychelles.html
+ * @see http://www.geonames.org/SC/administrative-division-seychelles.html
  */
 class ScSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/SdSubdivisionCode.php b/library/Rules/SubdivisionCode/SdSubdivisionCode.php
index 78ef8ce2..1fb3e126 100644
--- a/library/Rules/SubdivisionCode/SdSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/SdSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: SD
  *
- * @link http://www.geonames.org/SD/administrative-division-sudan.html
+ * @see http://www.geonames.org/SD/administrative-division-sudan.html
  */
 class SdSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/SeSubdivisionCode.php b/library/Rules/SubdivisionCode/SeSubdivisionCode.php
index 273cf470..76b975cd 100644
--- a/library/Rules/SubdivisionCode/SeSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/SeSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: SE
  *
- * @link http://www.geonames.org/SE/administrative-division-sweden.html
+ * @see http://www.geonames.org/SE/administrative-division-sweden.html
  */
 class SeSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/SgSubdivisionCode.php b/library/Rules/SubdivisionCode/SgSubdivisionCode.php
index 7cad35e5..88b9254e 100644
--- a/library/Rules/SubdivisionCode/SgSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/SgSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: SG
  *
- * @link http://www.geonames.org/SG/administrative-division-singapore.html
+ * @see http://www.geonames.org/SG/administrative-division-singapore.html
  */
 class SgSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/ShSubdivisionCode.php b/library/Rules/SubdivisionCode/ShSubdivisionCode.php
index c2189a64..141f2bb0 100644
--- a/library/Rules/SubdivisionCode/ShSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/ShSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: SH
  *
- * @link http://www.geonames.org/SH/administrative-division-saint-helena.html
+ * @see http://www.geonames.org/SH/administrative-division-saint-helena.html
  */
 class ShSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/SiSubdivisionCode.php b/library/Rules/SubdivisionCode/SiSubdivisionCode.php
index 959785ee..68b88108 100644
--- a/library/Rules/SubdivisionCode/SiSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/SiSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: SI
  *
- * @link http://www.geonames.org/SI/administrative-division-slovenia.html
+ * @see http://www.geonames.org/SI/administrative-division-slovenia.html
  */
 class SiSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/SjSubdivisionCode.php b/library/Rules/SubdivisionCode/SjSubdivisionCode.php
index d66c2e80..e0c0e0ea 100644
--- a/library/Rules/SubdivisionCode/SjSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/SjSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: SJ
  *
- * @link http://www.geonames.org/SJ/administrative-division-svalbard-and-jan-mayen.html
+ * @see http://www.geonames.org/SJ/administrative-division-svalbard-and-jan-mayen.html
  */
 class SjSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/SkSubdivisionCode.php b/library/Rules/SubdivisionCode/SkSubdivisionCode.php
index 620d5d10..fb9f7c7b 100644
--- a/library/Rules/SubdivisionCode/SkSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/SkSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: SK
  *
- * @link http://www.geonames.org/SK/administrative-division-slovakia.html
+ * @see http://www.geonames.org/SK/administrative-division-slovakia.html
  */
 class SkSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/SlSubdivisionCode.php b/library/Rules/SubdivisionCode/SlSubdivisionCode.php
index ac6fb83c..4656d65e 100644
--- a/library/Rules/SubdivisionCode/SlSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/SlSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: SL
  *
- * @link http://www.geonames.org/SL/administrative-division-sierra-leone.html
+ * @see http://www.geonames.org/SL/administrative-division-sierra-leone.html
  */
 class SlSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/SmSubdivisionCode.php b/library/Rules/SubdivisionCode/SmSubdivisionCode.php
index d81be92b..b37915d8 100644
--- a/library/Rules/SubdivisionCode/SmSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/SmSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: SM
  *
- * @link http://www.geonames.org/SM/administrative-division-san-marino.html
+ * @see http://www.geonames.org/SM/administrative-division-san-marino.html
  */
 class SmSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/SnSubdivisionCode.php b/library/Rules/SubdivisionCode/SnSubdivisionCode.php
index 09edb611..ee6f05d7 100644
--- a/library/Rules/SubdivisionCode/SnSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/SnSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: SN
  *
- * @link http://www.geonames.org/SN/administrative-division-senegal.html
+ * @see http://www.geonames.org/SN/administrative-division-senegal.html
  */
 class SnSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/SoSubdivisionCode.php b/library/Rules/SubdivisionCode/SoSubdivisionCode.php
index d0fe1b57..341cd993 100644
--- a/library/Rules/SubdivisionCode/SoSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/SoSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: SO
  *
- * @link http://www.geonames.org/SO/administrative-division-somalia.html
+ * @see http://www.geonames.org/SO/administrative-division-somalia.html
  */
 class SoSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/SrSubdivisionCode.php b/library/Rules/SubdivisionCode/SrSubdivisionCode.php
index d560c2d1..b9f51632 100644
--- a/library/Rules/SubdivisionCode/SrSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/SrSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: SR
  *
- * @link http://www.geonames.org/SR/administrative-division-suriname.html
+ * @see http://www.geonames.org/SR/administrative-division-suriname.html
  */
 class SrSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/SsSubdivisionCode.php b/library/Rules/SubdivisionCode/SsSubdivisionCode.php
index b2ed2833..e36a1e0c 100644
--- a/library/Rules/SubdivisionCode/SsSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/SsSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: SS
  *
- * @link http://www.geonames.org/SS/administrative-division-south-sudan.html
+ * @see http://www.geonames.org/SS/administrative-division-south-sudan.html
  */
 class SsSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/StSubdivisionCode.php b/library/Rules/SubdivisionCode/StSubdivisionCode.php
index 5f08b04e..7b0af334 100644
--- a/library/Rules/SubdivisionCode/StSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/StSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: ST
  *
- * @link http://www.geonames.org/ST/administrative-division-sao-tome-and-principe.html
+ * @see http://www.geonames.org/ST/administrative-division-sao-tome-and-principe.html
  */
 class StSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/SvSubdivisionCode.php b/library/Rules/SubdivisionCode/SvSubdivisionCode.php
index f30e7c3f..e49e714c 100644
--- a/library/Rules/SubdivisionCode/SvSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/SvSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: SV
  *
- * @link http://www.geonames.org/SV/administrative-division-el-salvador.html
+ * @see http://www.geonames.org/SV/administrative-division-el-salvador.html
  */
 class SvSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/SxSubdivisionCode.php b/library/Rules/SubdivisionCode/SxSubdivisionCode.php
index f89823a4..b91f4b47 100644
--- a/library/Rules/SubdivisionCode/SxSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/SxSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: SX
  *
- * @link http://www.geonames.org/SX/administrative-division-sint-maarten.html
+ * @see http://www.geonames.org/SX/administrative-division-sint-maarten.html
  */
 class SxSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/SySubdivisionCode.php b/library/Rules/SubdivisionCode/SySubdivisionCode.php
index 8bc62428..8ac49c87 100644
--- a/library/Rules/SubdivisionCode/SySubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/SySubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: SY
  *
- * @link http://www.geonames.org/SY/administrative-division-syria.html
+ * @see http://www.geonames.org/SY/administrative-division-syria.html
  */
 class SySubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/SzSubdivisionCode.php b/library/Rules/SubdivisionCode/SzSubdivisionCode.php
index 94f64e7e..e22c4a09 100644
--- a/library/Rules/SubdivisionCode/SzSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/SzSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: SZ
  *
- * @link http://www.geonames.org/SZ/administrative-division-swaziland.html
+ * @see http://www.geonames.org/SZ/administrative-division-swaziland.html
  */
 class SzSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/TcSubdivisionCode.php b/library/Rules/SubdivisionCode/TcSubdivisionCode.php
index dfea0c09..167a847c 100644
--- a/library/Rules/SubdivisionCode/TcSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/TcSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: TC
  *
- * @link http://www.geonames.org/TC/administrative-division-turks-and-caicos-islands.html
+ * @see http://www.geonames.org/TC/administrative-division-turks-and-caicos-islands.html
  */
 class TcSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/TdSubdivisionCode.php b/library/Rules/SubdivisionCode/TdSubdivisionCode.php
index 1aea66c0..c217e439 100644
--- a/library/Rules/SubdivisionCode/TdSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/TdSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: TD
  *
- * @link http://www.geonames.org/TD/administrative-division-chad.html
+ * @see http://www.geonames.org/TD/administrative-division-chad.html
  */
 class TdSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/TfSubdivisionCode.php b/library/Rules/SubdivisionCode/TfSubdivisionCode.php
index 2cee3515..1068cc4f 100644
--- a/library/Rules/SubdivisionCode/TfSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/TfSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: TF
  *
- * @link http://www.geonames.org/TF/administrative-division-french-southern-territories.html
+ * @see http://www.geonames.org/TF/administrative-division-french-southern-territories.html
  */
 class TfSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/TgSubdivisionCode.php b/library/Rules/SubdivisionCode/TgSubdivisionCode.php
index dd87ff02..ede07933 100644
--- a/library/Rules/SubdivisionCode/TgSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/TgSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: TG
  *
- * @link http://www.geonames.org/TG/administrative-division-togo.html
+ * @see http://www.geonames.org/TG/administrative-division-togo.html
  */
 class TgSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/ThSubdivisionCode.php b/library/Rules/SubdivisionCode/ThSubdivisionCode.php
index b7a479aa..df07e209 100644
--- a/library/Rules/SubdivisionCode/ThSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/ThSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: TH
  *
- * @link http://www.geonames.org/TH/administrative-division-thailand.html
+ * @see http://www.geonames.org/TH/administrative-division-thailand.html
  */
 class ThSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/TjSubdivisionCode.php b/library/Rules/SubdivisionCode/TjSubdivisionCode.php
index 12d5ae0b..1d31eacd 100644
--- a/library/Rules/SubdivisionCode/TjSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/TjSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: TJ
  *
- * @link http://www.geonames.org/TJ/administrative-division-tajikistan.html
+ * @see http://www.geonames.org/TJ/administrative-division-tajikistan.html
  */
 class TjSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/TkSubdivisionCode.php b/library/Rules/SubdivisionCode/TkSubdivisionCode.php
index 13ce7c8b..e12232c5 100644
--- a/library/Rules/SubdivisionCode/TkSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/TkSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: TK
  *
- * @link http://www.geonames.org/TK/administrative-division-tokelau.html
+ * @see http://www.geonames.org/TK/administrative-division-tokelau.html
  */
 class TkSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/TlSubdivisionCode.php b/library/Rules/SubdivisionCode/TlSubdivisionCode.php
index b803a9a6..8b794cfd 100644
--- a/library/Rules/SubdivisionCode/TlSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/TlSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: TL
  *
- * @link http://www.geonames.org/TL/administrative-division-east-timor.html
+ * @see http://www.geonames.org/TL/administrative-division-east-timor.html
  */
 class TlSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/TmSubdivisionCode.php b/library/Rules/SubdivisionCode/TmSubdivisionCode.php
index b9a4540b..4bef1c2b 100644
--- a/library/Rules/SubdivisionCode/TmSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/TmSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: TM
  *
- * @link http://www.geonames.org/TM/administrative-division-turkmenistan.html
+ * @see http://www.geonames.org/TM/administrative-division-turkmenistan.html
  */
 class TmSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/TnSubdivisionCode.php b/library/Rules/SubdivisionCode/TnSubdivisionCode.php
index 90c621cf..51979c9d 100644
--- a/library/Rules/SubdivisionCode/TnSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/TnSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: TN
  *
- * @link http://www.geonames.org/TN/administrative-division-tunisia.html
+ * @see http://www.geonames.org/TN/administrative-division-tunisia.html
  */
 class TnSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/ToSubdivisionCode.php b/library/Rules/SubdivisionCode/ToSubdivisionCode.php
index 2d895e6d..cd88baab 100644
--- a/library/Rules/SubdivisionCode/ToSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/ToSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: TO
  *
- * @link http://www.geonames.org/TO/administrative-division-tonga.html
+ * @see http://www.geonames.org/TO/administrative-division-tonga.html
  */
 class ToSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/TrSubdivisionCode.php b/library/Rules/SubdivisionCode/TrSubdivisionCode.php
index 88605bae..3339d4d4 100644
--- a/library/Rules/SubdivisionCode/TrSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/TrSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: TR
  *
- * @link http://www.geonames.org/TR/administrative-division-turkey.html
+ * @see http://www.geonames.org/TR/administrative-division-turkey.html
  */
 class TrSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/TtSubdivisionCode.php b/library/Rules/SubdivisionCode/TtSubdivisionCode.php
index a2106faa..dd21df46 100644
--- a/library/Rules/SubdivisionCode/TtSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/TtSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: TT
  *
- * @link http://www.geonames.org/TT/administrative-division-trinidad-and-tobago.html
+ * @see http://www.geonames.org/TT/administrative-division-trinidad-and-tobago.html
  */
 class TtSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/TvSubdivisionCode.php b/library/Rules/SubdivisionCode/TvSubdivisionCode.php
index 5757e7eb..990c4d8d 100644
--- a/library/Rules/SubdivisionCode/TvSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/TvSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: TV
  *
- * @link http://www.geonames.org/TV/administrative-division-tuvalu.html
+ * @see http://www.geonames.org/TV/administrative-division-tuvalu.html
  */
 class TvSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/TwSubdivisionCode.php b/library/Rules/SubdivisionCode/TwSubdivisionCode.php
index 83a83669..ac32ec74 100644
--- a/library/Rules/SubdivisionCode/TwSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/TwSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: TW
  *
- * @link http://www.geonames.org/TW/administrative-division-taiwan.html
+ * @see http://www.geonames.org/TW/administrative-division-taiwan.html
  */
 class TwSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/TzSubdivisionCode.php b/library/Rules/SubdivisionCode/TzSubdivisionCode.php
index b88e9511..ebb16488 100644
--- a/library/Rules/SubdivisionCode/TzSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/TzSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: TZ
  *
- * @link http://www.geonames.org/TZ/administrative-division-tanzania.html
+ * @see http://www.geonames.org/TZ/administrative-division-tanzania.html
  */
 class TzSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/UaSubdivisionCode.php b/library/Rules/SubdivisionCode/UaSubdivisionCode.php
index 8b4c9337..141e5b73 100644
--- a/library/Rules/SubdivisionCode/UaSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/UaSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: UA
  *
- * @link http://www.geonames.org/UA/administrative-division-ukraine.html
+ * @see http://www.geonames.org/UA/administrative-division-ukraine.html
  */
 class UaSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/UgSubdivisionCode.php b/library/Rules/SubdivisionCode/UgSubdivisionCode.php
index 108de4f9..60631ebe 100644
--- a/library/Rules/SubdivisionCode/UgSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/UgSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: UG
  *
- * @link http://www.geonames.org/UG/administrative-division-uganda.html
+ * @see http://www.geonames.org/UG/administrative-division-uganda.html
  */
 class UgSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/UmSubdivisionCode.php b/library/Rules/SubdivisionCode/UmSubdivisionCode.php
index 64a5fa2f..d6a65eb0 100644
--- a/library/Rules/SubdivisionCode/UmSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/UmSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: UM
  *
- * @link http://www.geonames.org/UM/administrative-division-united-states-minor-outlying-islands.html
+ * @see http://www.geonames.org/UM/administrative-division-united-states-minor-outlying-islands.html
  */
 class UmSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/UsSubdivisionCode.php b/library/Rules/SubdivisionCode/UsSubdivisionCode.php
index b9c86b35..ae5b44e6 100644
--- a/library/Rules/SubdivisionCode/UsSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/UsSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: US
  *
- * @link http://www.geonames.org/US/administrative-division-united-states.html
+ * @see http://www.geonames.org/US/administrative-division-united-states.html
  */
 class UsSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/UySubdivisionCode.php b/library/Rules/SubdivisionCode/UySubdivisionCode.php
index 8692cb58..60bbe284 100644
--- a/library/Rules/SubdivisionCode/UySubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/UySubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: UY
  *
- * @link http://www.geonames.org/UY/administrative-division-uruguay.html
+ * @see http://www.geonames.org/UY/administrative-division-uruguay.html
  */
 class UySubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/UzSubdivisionCode.php b/library/Rules/SubdivisionCode/UzSubdivisionCode.php
index fc7e9c9f..0079c6ef 100644
--- a/library/Rules/SubdivisionCode/UzSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/UzSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: UZ
  *
- * @link http://www.geonames.org/UZ/administrative-division-uzbekistan.html
+ * @see http://www.geonames.org/UZ/administrative-division-uzbekistan.html
  */
 class UzSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/VaSubdivisionCode.php b/library/Rules/SubdivisionCode/VaSubdivisionCode.php
index 2e128b54..61ec779b 100644
--- a/library/Rules/SubdivisionCode/VaSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/VaSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: VA
  *
- * @link http://www.geonames.org/VA/administrative-division-vatican-city.html
+ * @see http://www.geonames.org/VA/administrative-division-vatican-city.html
  */
 class VaSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/VcSubdivisionCode.php b/library/Rules/SubdivisionCode/VcSubdivisionCode.php
index 33912616..3d1eecbb 100644
--- a/library/Rules/SubdivisionCode/VcSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/VcSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: VC
  *
- * @link http://www.geonames.org/VC/administrative-division-saint-vincent-and-the-grenadines.html
+ * @see http://www.geonames.org/VC/administrative-division-saint-vincent-and-the-grenadines.html
  */
 class VcSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/VeSubdivisionCode.php b/library/Rules/SubdivisionCode/VeSubdivisionCode.php
index 7ec212fc..d850b309 100644
--- a/library/Rules/SubdivisionCode/VeSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/VeSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: VE
  *
- * @link http://www.geonames.org/VE/administrative-division-venezuela.html
+ * @see http://www.geonames.org/VE/administrative-division-venezuela.html
  */
 class VeSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/VgSubdivisionCode.php b/library/Rules/SubdivisionCode/VgSubdivisionCode.php
index 29240aca..72696acf 100644
--- a/library/Rules/SubdivisionCode/VgSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/VgSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: VG
  *
- * @link http://www.geonames.org/VG/administrative-division-british-virgin-islands.html
+ * @see http://www.geonames.org/VG/administrative-division-british-virgin-islands.html
  */
 class VgSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/ViSubdivisionCode.php b/library/Rules/SubdivisionCode/ViSubdivisionCode.php
index 684f8e6d..e5a70b5f 100644
--- a/library/Rules/SubdivisionCode/ViSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/ViSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: VI
  *
- * @link http://www.geonames.org/VI/administrative-division-u-s-virgin-islands.html
+ * @see http://www.geonames.org/VI/administrative-division-u-s-virgin-islands.html
  */
 class ViSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/VnSubdivisionCode.php b/library/Rules/SubdivisionCode/VnSubdivisionCode.php
index cdd449e7..2e3b30ee 100644
--- a/library/Rules/SubdivisionCode/VnSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/VnSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: VN
  *
- * @link http://www.geonames.org/VN/administrative-division-vietnam.html
+ * @see http://www.geonames.org/VN/administrative-division-vietnam.html
  */
 class VnSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/VuSubdivisionCode.php b/library/Rules/SubdivisionCode/VuSubdivisionCode.php
index 8657749b..60a546d0 100644
--- a/library/Rules/SubdivisionCode/VuSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/VuSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: VU
  *
- * @link http://www.geonames.org/VU/administrative-division-vanuatu.html
+ * @see http://www.geonames.org/VU/administrative-division-vanuatu.html
  */
 class VuSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/WfSubdivisionCode.php b/library/Rules/SubdivisionCode/WfSubdivisionCode.php
index 6794f0f2..54af99d0 100644
--- a/library/Rules/SubdivisionCode/WfSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/WfSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: WF
  *
- * @link http://www.geonames.org/WF/administrative-division-wallis-and-futuna.html
+ * @see http://www.geonames.org/WF/administrative-division-wallis-and-futuna.html
  */
 class WfSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/WsSubdivisionCode.php b/library/Rules/SubdivisionCode/WsSubdivisionCode.php
index 9d1ab9ef..163153a8 100644
--- a/library/Rules/SubdivisionCode/WsSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/WsSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: WS
  *
- * @link http://www.geonames.org/WS/administrative-division-samoa.html
+ * @see http://www.geonames.org/WS/administrative-division-samoa.html
  */
 class WsSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/XkSubdivisionCode.php b/library/Rules/SubdivisionCode/XkSubdivisionCode.php
index 98c039eb..78d2ca86 100644
--- a/library/Rules/SubdivisionCode/XkSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/XkSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: XK
  *
- * @link http://www.geonames.org/XK/administrative-division-kosovo.html
+ * @see http://www.geonames.org/XK/administrative-division-kosovo.html
  */
 class XkSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/YeSubdivisionCode.php b/library/Rules/SubdivisionCode/YeSubdivisionCode.php
index fbfaf3e3..df2bd45a 100644
--- a/library/Rules/SubdivisionCode/YeSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/YeSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: YE
  *
- * @link http://www.geonames.org/YE/administrative-division-yemen.html
+ * @see http://www.geonames.org/YE/administrative-division-yemen.html
  */
 class YeSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/YtSubdivisionCode.php b/library/Rules/SubdivisionCode/YtSubdivisionCode.php
index a3ae34f0..54d88194 100644
--- a/library/Rules/SubdivisionCode/YtSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/YtSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: YT
  *
- * @link http://www.geonames.org/YT/administrative-division-mayotte.html
+ * @see http://www.geonames.org/YT/administrative-division-mayotte.html
  */
 class YtSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/ZaSubdivisionCode.php b/library/Rules/SubdivisionCode/ZaSubdivisionCode.php
index 1efcef7e..10e22842 100644
--- a/library/Rules/SubdivisionCode/ZaSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/ZaSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: ZA
  *
- * @link http://www.geonames.org/ZA/administrative-division-south-africa.html
+ * @see http://www.geonames.org/ZA/administrative-division-south-africa.html
  */
 class ZaSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/ZmSubdivisionCode.php b/library/Rules/SubdivisionCode/ZmSubdivisionCode.php
index 1a7902f0..46ba9172 100644
--- a/library/Rules/SubdivisionCode/ZmSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/ZmSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: ZM
  *
- * @link http://www.geonames.org/ZM/administrative-division-zambia.html
+ * @see http://www.geonames.org/ZM/administrative-division-zambia.html
  */
 class ZmSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SubdivisionCode/ZwSubdivisionCode.php b/library/Rules/SubdivisionCode/ZwSubdivisionCode.php
index 9b873b5b..93ec0ff4 100644
--- a/library/Rules/SubdivisionCode/ZwSubdivisionCode.php
+++ b/library/Rules/SubdivisionCode/ZwSubdivisionCode.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\SubdivisionCode;
 
 use Respect\Validation\Rules\AbstractSearcher;
@@ -18,7 +20,7 @@ use Respect\Validation\Rules\AbstractSearcher;
  *
  * ISO 3166-1 alpha-2: ZW
  *
- * @link http://www.geonames.org/ZW/administrative-division-zimbabwe.html
+ * @see http://www.geonames.org/ZW/administrative-division-zimbabwe.html
  */
 class ZwSubdivisionCode extends AbstractSearcher
 {
diff --git a/library/Rules/SymbolicLink.php b/library/Rules/SymbolicLink.php
index e67fe3eb..d2955063 100644
--- a/library/Rules/SymbolicLink.php
+++ b/library/Rules/SymbolicLink.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 class SymbolicLink extends AbstractRule
diff --git a/library/Rules/Tld.php b/library/Rules/Tld.php
index 8649e8fd..c9cc8289 100644
--- a/library/Rules/Tld.php
+++ b/library/Rules/Tld.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 class Tld extends AbstractRule
@@ -1552,6 +1554,6 @@ class Tld extends AbstractRule
 
     public function validate($input)
     {
-        return in_array(mb_strtoupper($input), $this->tldList);
+        return in_array(mb_strtoupper((string) $input), $this->tldList);
     }
 }
diff --git a/library/Rules/TrueVal.php b/library/Rules/TrueVal.php
index 33a744e5..e576718e 100644
--- a/library/Rules/TrueVal.php
+++ b/library/Rules/TrueVal.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 class TrueVal extends AbstractRule
diff --git a/library/Rules/Type.php b/library/Rules/Type.php
index 686756f8..19f9412a 100644
--- a/library/Rules/Type.php
+++ b/library/Rules/Type.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 use Respect\Validation\Exceptions\ComponentException;
diff --git a/library/Rules/Unique.php b/library/Rules/Unique.php
index 195b22af..9dc642a6 100644
--- a/library/Rules/Unique.php
+++ b/library/Rules/Unique.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 class Unique extends AbstractRule
diff --git a/library/Rules/Uploaded.php b/library/Rules/Uploaded.php
index 1c8bc6fe..c7d0ed08 100644
--- a/library/Rules/Uploaded.php
+++ b/library/Rules/Uploaded.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 class Uploaded extends AbstractRule
diff --git a/library/Rules/Uppercase.php b/library/Rules/Uppercase.php
index cfd9df3f..eb2401a2 100644
--- a/library/Rules/Uppercase.php
+++ b/library/Rules/Uppercase.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 class Uppercase extends AbstractRule
diff --git a/library/Rules/Url.php b/library/Rules/Url.php
index e2ff6cf7..29933999 100644
--- a/library/Rules/Url.php
+++ b/library/Rules/Url.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 class Url extends FilterVar
diff --git a/library/Rules/Uuid.php b/library/Rules/Uuid.php
index c8e35d24..9ac172da 100644
--- a/library/Rules/Uuid.php
+++ b/library/Rules/Uuid.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 class Uuid extends AbstractRegexRule
diff --git a/library/Rules/Vatin.php b/library/Rules/Vatin.php
index 52e89b42..f78e6630 100644
--- a/library/Rules/Vatin.php
+++ b/library/Rules/Vatin.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 use Respect\Validation\Exceptions\ComponentException;
diff --git a/library/Rules/Version.php b/library/Rules/Version.php
index 9b764ca7..1a760435 100644
--- a/library/Rules/Version.php
+++ b/library/Rules/Version.php
@@ -9,10 +9,12 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 /**
- * @link http://semver.org/
+ * @see http://semver.org/
  */
 class Version extends AbstractRule
 {
diff --git a/library/Rules/VideoUrl.php b/library/Rules/VideoUrl.php
index ed61cd5d..b47be183 100644
--- a/library/Rules/VideoUrl.php
+++ b/library/Rules/VideoUrl.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 use Respect\Validation\Exceptions\ComponentException;
@@ -38,15 +40,15 @@ class VideoUrl extends AbstractRule
      *
      * @param string $service
      */
-    public function __construct($service = null)
+    public function __construct(string $service = null)
     {
-        $serviceKey = mb_strtolower($service);
+        $serviceKey = mb_strtolower((string) $service);
         if (null !== $service && !isset($this->services[$serviceKey])) {
             throw new ComponentException(sprintf('"%s" is not a recognized video service.', $service));
         }
 
         $this->service = $service;
-        $this->serviceKey = mb_strtolower($service);
+        $this->serviceKey = $serviceKey;
     }
 
     /**
@@ -55,11 +57,11 @@ class VideoUrl extends AbstractRule
     public function validate($input)
     {
         if (isset($this->services[$this->serviceKey])) {
-            return preg_match($this->services[$this->serviceKey], $input) > 0;
+            return preg_match($this->services[$this->serviceKey], (string) $input) > 0;
         }
 
         foreach ($this->services as $pattern) {
-            if (0 === preg_match($pattern, $input)) {
+            if (0 === preg_match($pattern, (string) $input)) {
                 continue;
             }
 
diff --git a/library/Rules/Vowel.php b/library/Rules/Vowel.php
index 8157b317..a6db0532 100644
--- a/library/Rules/Vowel.php
+++ b/library/Rules/Vowel.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 class Vowel extends AbstractRegexRule
diff --git a/library/Rules/When.php b/library/Rules/When.php
index 25afce46..b09ec92b 100644
--- a/library/Rules/When.php
+++ b/library/Rules/When.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 use Respect\Validation\Exceptions\AlwaysInvalidException;
diff --git a/library/Rules/Writable.php b/library/Rules/Writable.php
index 5fba9782..dc108ef1 100644
--- a/library/Rules/Writable.php
+++ b/library/Rules/Writable.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 class Writable extends AbstractRule
diff --git a/library/Rules/Xdigit.php b/library/Rules/Xdigit.php
index 4a377cbd..2a9fbcae 100644
--- a/library/Rules/Xdigit.php
+++ b/library/Rules/Xdigit.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 class Xdigit extends AbstractCtypeRule
diff --git a/library/Rules/Yes.php b/library/Rules/Yes.php
index 4c8b52fc..effd3715 100644
--- a/library/Rules/Yes.php
+++ b/library/Rules/Yes.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 class Yes extends Regex
diff --git a/library/Rules/Zend.php b/library/Rules/Zend.php
index 69681d67..035497e6 100644
--- a/library/Rules/Zend.php
+++ b/library/Rules/Zend.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 use ReflectionClass;
diff --git a/library/Validatable.php b/library/Validatable.php
index ad53ecf8..c2cd4039 100644
--- a/library/Validatable.php
+++ b/library/Validatable.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation;
 
 /** Interface for validation rules */
diff --git a/library/Validator.php b/library/Validator.php
index 57472a53..bf4bcc4c 100644
--- a/library/Validator.php
+++ b/library/Validator.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation;
 
 use finfo;
@@ -176,7 +178,7 @@ class Validator extends AllOf
     /**
      * @param Factory $factory
      */
-    public static function setFactory($factory)
+    public static function setFactory($factory): void
     {
         static::$factory = $factory;
     }
@@ -185,7 +187,7 @@ class Validator extends AllOf
      * @param string $rulePrefix
      * @param bool   $prepend
      */
-    public static function with($rulePrefix, $prepend = false)
+    public static function with($rulePrefix, $prepend = false): void
     {
         if (false === $prepend) {
             self::getFactory()->appendRulePrefix($rulePrefix);
@@ -199,7 +201,7 @@ class Validator extends AllOf
         try {
             return parent::check($input);
         } catch (ValidationException $exception) {
-            if (count($this->getRules()) == 1 && $this->template) {
+            if (1 == count($this->getRules()) && $this->template) {
                 $exception->setTemplate($this->template);
             }
 
diff --git a/tests/integration/issue-719.phpt b/tests/integration/issue-719.phpt
index b886eff4..c9a71fa0 100644
--- a/tests/integration/issue-719.phpt
+++ b/tests/integration/issue-719.phpt
@@ -13,9 +13,9 @@ $input = [
 ];
 
 $rules = [
-    v::key('user_name',     v::numericVal())->setName('First Name'),
-    v::key('user_surname',  v::numericVal())->setName('Second Name'),
-    v::key('user_tel',      v::phone())->setName('Phone number'),
+    v::key('user_name', v::numericVal())->setName('First Name'),
+    v::key('user_surname', v::numericVal())->setName('Second Name'),
+    v::key('user_tel', v::phone())->setName('Phone number'),
 ];
 
 try {
diff --git a/tests/integration/rules/beetwen_2.phpt b/tests/integration/rules/beetwen_2.phpt
index 768f8754..eb1c7286 100644
--- a/tests/integration/rules/beetwen_2.phpt
+++ b/tests/integration/rules/beetwen_2.phpt
@@ -2,13 +2,14 @@
 <?php
 require 'vendor/autoload.php';
 
-use Respect\Validation\Validator as v;
 use Respect\Validation\Exceptions\MaxException;
+use Respect\Validation\Validator as v;
 
 try {
     v::intType()->between(1, 2)->check(42);
 } catch (MaxException $e) {
     echo $e->getMainMessage().PHP_EOL;
 }
+?>
 --EXPECTF--
 42 must be less than or equal to 2
diff --git a/tests/integration/rules/beetwen_3.phpt b/tests/integration/rules/beetwen_3.phpt
index 77ec9073..c0b2733c 100644
--- a/tests/integration/rules/beetwen_3.phpt
+++ b/tests/integration/rules/beetwen_3.phpt
@@ -2,13 +2,14 @@
 <?php
 require 'vendor/autoload.php';
 
-use Respect\Validation\Validator as v;
 use Respect\Validation\Exceptions\MinException;
+use Respect\Validation\Validator as v;
 
 try {
     v::intType()->between(1, 2)->check(-42);
 } catch (MinException $e) {
     echo $e->getMainMessage().PHP_EOL;
 }
+?>
 --EXPECTF--
 -42 must be greater than or equal to 1
diff --git a/tests/integration/rules/beetwen_4.phpt b/tests/integration/rules/beetwen_4.phpt
index 2eea7eb3..c441cdd5 100644
--- a/tests/integration/rules/beetwen_4.phpt
+++ b/tests/integration/rules/beetwen_4.phpt
@@ -2,13 +2,14 @@
 <?php
 require 'vendor/autoload.php';
 
-use Respect\Validation\Validator as v;
 use Respect\Validation\Exceptions\AllOfException;
+use Respect\Validation\Validator as v;
 
 try {
     v::between('a', 'b')->assert('c');
 } catch (AllOfException $e) {
     echo $e->getFullMessage();
 }
+?>
 --EXPECTF--
 - "c" must be less than or equal to "b"
diff --git a/tests/integration/rules/beetwen_5.phpt b/tests/integration/rules/beetwen_5.phpt
index 17dbe825..c0045696 100644
--- a/tests/integration/rules/beetwen_5.phpt
+++ b/tests/integration/rules/beetwen_5.phpt
@@ -2,13 +2,14 @@
 <?php
 require 'vendor/autoload.php';
 
-use Respect\Validation\Validator as v;
 use Respect\Validation\Exceptions\AllOfException;
+use Respect\Validation\Validator as v;
 
 try {
     v::not(v::between('a', 'b'))->assert('a');
 } catch (AllOfException $e) {
     echo $e->getFullMessage();
 }
+?>
 --EXPECTF--
 - "a" must not be less than or equal to "b"
diff --git a/tests/integration/rules/beetwen_6.phpt b/tests/integration/rules/beetwen_6.phpt
index 4a001be9..d03a258a 100644
--- a/tests/integration/rules/beetwen_6.phpt
+++ b/tests/integration/rules/beetwen_6.phpt
@@ -2,13 +2,14 @@
 <?php
 require 'vendor/autoload.php';
 
-use Respect\Validation\Validator as v;
 use Respect\Validation\Exceptions\AllOfException;
+use Respect\Validation\Validator as v;
 
 try {
     v::not(v::intType()->between(1, 42))->assert(41);
 } catch (AllOfException $e) {
     echo $e->getFullMessage();
 }
+?>
 --EXPECTF--
 - 41 must not be less than or equal to 42
diff --git a/tests/integration/rules/callableType_1.phpt b/tests/integration/rules/callableType_1.phpt
index 22aa3ddb..a9a790f4 100644
--- a/tests/integration/rules/callableType_1.phpt
+++ b/tests/integration/rules/callableType_1.phpt
@@ -4,7 +4,7 @@ require 'vendor/autoload.php';
 
 use Respect\Validation\Validator as v;
 
-v::callableType()->validate(function () {
+v::callableType()->validate(function (): void {
 });
 v::callableType()->validate('trim');
 v::callableType()->validate(v::callableType(), 'validate');
diff --git a/tests/integration/rules/callableType_4.phpt b/tests/integration/rules/callableType_4.phpt
index 68cd404e..43981868 100644
--- a/tests/integration/rules/callableType_4.phpt
+++ b/tests/integration/rules/callableType_4.phpt
@@ -12,7 +12,7 @@ use Respect\Validation\Exceptions\CallableTypeException;
 use Respect\Validation\Validator as v;
 
 try {
-    $x = function () {
+    $x = function (): void {
     };
     v::not(v::callableType())->check($x);
 } catch (CallableTypeException $e) {
diff --git a/tests/integration/rules/cnpj_1.phpt b/tests/integration/rules/cnpj_1.phpt
index dd079490..1aa2c13d 100644
--- a/tests/integration/rules/cnpj_1.phpt
+++ b/tests/integration/rules/cnpj_1.phpt
@@ -7,5 +7,5 @@ use Respect\Validation\Validator as v;
 
 v::cnpj()->check('53969447000130');
 v::cnpj()->assert('53969447000130');
-
---EXPECTF--;
\ No newline at end of file
+?>
+--EXPECTF--;
diff --git a/tests/integration/rules/cnpj_2.phpt b/tests/integration/rules/cnpj_2.phpt
index 8042e885..3d5b6af4 100644
--- a/tests/integration/rules/cnpj_2.phpt
+++ b/tests/integration/rules/cnpj_2.phpt
@@ -3,15 +3,14 @@
 
 require_once 'vendor/autoload.php';
 
-use Respect\Validation\Validator as v;
 use Respect\Validation\Exceptions\CnpjException;
+use Respect\Validation\Validator as v;
 
-try
-{
-	v::cnpj()->check('não cnpj');
+try {
+    v::cnpj()->check('não cnpj');
 } catch (CnpjException $e) {
-	echo $e->getMainMessage();
+    echo $e->getMainMessage();
 }
-
+?>
 --EXPECTF--;
-"não cnpj" must be a valid CNPJ number
\ No newline at end of file
+"não cnpj" must be a valid CNPJ number
diff --git a/tests/integration/rules/cnpj_3.phpt b/tests/integration/rules/cnpj_3.phpt
index 4c1cbcfc..1123cb92 100644
--- a/tests/integration/rules/cnpj_3.phpt
+++ b/tests/integration/rules/cnpj_3.phpt
@@ -3,14 +3,14 @@
 
 require_once 'vendor/autoload.php';
 
-use Respect\Validation\Validator as v;
 use Respect\Validation\Exceptions\AllOfException;
+use Respect\Validation\Validator as v;
 
-try
-{
-	v::cnpj()->assert('test');
+try {
+    v::cnpj()->assert('test');
 } catch (AllOfException $e) {
-	echo $e->getFullMessage();
+    echo $e->getFullMessage();
 }
+?>
 --EXPECTF--
-- "test" must be a valid CNPJ number
\ No newline at end of file
+- "test" must be a valid CNPJ number
diff --git a/tests/integration/rules/cnpj_4.phpt b/tests/integration/rules/cnpj_4.phpt
index 9161a283..34dffbbe 100644
--- a/tests/integration/rules/cnpj_4.phpt
+++ b/tests/integration/rules/cnpj_4.phpt
@@ -3,15 +3,14 @@
 
 require_once 'vendor/autoload.php';
 
-use Respect\Validation\Validator as v;
 use Respect\Validation\Exceptions\CnpjException;
+use Respect\Validation\Validator as v;
 
-try
-{
-	v::not(v::cnpj())->check('65.150.175/0001-20');
+try {
+    v::not(v::cnpj())->check('65.150.175/0001-20');
 } catch (CnpjException $e) {
-	echo $e->getMainMessage();
+    echo $e->getMainMessage();
 }
-
+?>
 --EXPECTF--
-"65.150.175/0001-20" must not be a valid CNPJ number
\ No newline at end of file
+"65.150.175/0001-20" must not be a valid CNPJ number
diff --git a/tests/integration/rules/cnpj_5.phpt b/tests/integration/rules/cnpj_5.phpt
index 7bd14dad..90c6b79f 100644
--- a/tests/integration/rules/cnpj_5.phpt
+++ b/tests/integration/rules/cnpj_5.phpt
@@ -3,15 +3,14 @@
 
 require_once 'vendor/autoload.php';
 
-use Respect\Validation\Validator as v;
 use Respect\Validation\Exceptions\AllOfException;
+use Respect\Validation\Validator as v;
 
-try
-{
-	v::not(v::cnpj())->assert('65150175000120');
+try {
+    v::not(v::cnpj())->assert('65150175000120');
 } catch (AllOfException $e) {
-	echo $e->getFullMessage();
+    echo $e->getFullMessage();
 }
-
+?>
 --EXPECTF--
-- "65150175000120" must not be a valid CNPJ number
\ No newline at end of file
+- "65150175000120" must not be a valid CNPJ number
diff --git a/tests/integration/rules/cnpj_6.phpt b/tests/integration/rules/cnpj_6.phpt
index 30b25dba..6f67df2e 100644
--- a/tests/integration/rules/cnpj_6.phpt
+++ b/tests/integration/rules/cnpj_6.phpt
@@ -3,15 +3,14 @@
 
 require_once 'vendor/autoload.php';
 
-use Respect\Validation\Validator as v;
 use Respect\Validation\Exceptions\AllOfException;
+use Respect\Validation\Validator as v;
 
-try
-{
-	v::cnpj()->digit()->assert('65.150.175/0001-20');
+try {
+    v::cnpj()->digit()->assert('65.150.175/0001-20');
 } catch (AllOfException $e) {
-	echo $e->getFullMessage();
+    echo $e->getFullMessage();
 }
-
+?>
 --EXPECTF--
-- "65.150.175/0001-20" must contain only digits (0-9)
\ No newline at end of file
+- "65.150.175/0001-20" must contain only digits (0-9)
diff --git a/tests/integration/rules/consonant_1.phpt b/tests/integration/rules/consonant_1.phpt
index 64ec56de..dbc0f8e6 100644
--- a/tests/integration/rules/consonant_1.phpt
+++ b/tests/integration/rules/consonant_1.phpt
@@ -8,4 +8,5 @@ v::consonant()->check('bcd');
 v::consonant()->assert('ddd');
 v::not(v::consonant())->check('uou');
 v::not(v::consonant())->assert('aaaaa');
+?>
 --EXPECTF--
diff --git a/tests/integration/rules/consonant_2.phpt b/tests/integration/rules/consonant_2.phpt
index 4f587078..7177b093 100644
--- a/tests/integration/rules/consonant_2.phpt
+++ b/tests/integration/rules/consonant_2.phpt
@@ -2,13 +2,14 @@
 <?php
 require 'vendor/autoload.php';
 
-use Respect\Validation\Validator as v;
 use Respect\Validation\Exceptions\ConsonantException;
+use Respect\Validation\Validator as v;
 
 try {
     v::consonant()->check('top nos falsetes');
 } catch (ConsonantException $e) {
     echo $e->getMainMessage();
 }
+?>
 --EXPECTF--
 "top nos falsetes" must contain only consonants
diff --git a/tests/integration/rules/consonant_3.phpt b/tests/integration/rules/consonant_3.phpt
index ccb7554f..b535da20 100644
--- a/tests/integration/rules/consonant_3.phpt
+++ b/tests/integration/rules/consonant_3.phpt
@@ -2,13 +2,14 @@
 <?php
 require 'vendor/autoload.php';
 
-use Respect\Validation\Validator as v;
 use Respect\Validation\Exceptions\ConsonantException;
+use Respect\Validation\Validator as v;
 
 try {
     v::not(v::consonant())->check('ddd');
 } catch (ConsonantException $e) {
     echo $e->getMainMessage();
 }
+?>
 --EXPECTF--
 "ddd" must not contain consonants
diff --git a/tests/integration/rules/consonant_4.phpt b/tests/integration/rules/consonant_4.phpt
index 8112c010..279ccf36 100644
--- a/tests/integration/rules/consonant_4.phpt
+++ b/tests/integration/rules/consonant_4.phpt
@@ -2,13 +2,14 @@
 <?php
 require 'vendor/autoload.php';
 
-use Respect\Validation\Validator as v;
 use Respect\Validation\Exceptions\AllOfException;
+use Respect\Validation\Validator as v;
 
 try {
     v::consonant()->assert('Jaspion');
 } catch (AllOfException $e) {
     echo $e->getFullMessage();
 }
+?>
 --EXPECTF--
 - "Jaspion" must contain only consonants
diff --git a/tests/integration/rules/consonant_5.phpt b/tests/integration/rules/consonant_5.phpt
index 8fff0e96..6052ab9f 100644
--- a/tests/integration/rules/consonant_5.phpt
+++ b/tests/integration/rules/consonant_5.phpt
@@ -2,13 +2,14 @@
 <?php
 require 'vendor/autoload.php';
 
-use Respect\Validation\Validator as v;
 use Respect\Validation\Exceptions\AllOfException;
+use Respect\Validation\Validator as v;
 
 try {
     v::not(v::consonant())->assert('bb');
 } catch (AllOfException $e) {
     echo $e->getFullMessage();
 }
+?>
 --EXPECTF--
 - "bb" must not contain consonants
diff --git a/tests/integration/rules/digit_1.phpt b/tests/integration/rules/digit_1.phpt
index 155e22c5..b24118d2 100644
--- a/tests/integration/rules/digit_1.phpt
+++ b/tests/integration/rules/digit_1.phpt
@@ -6,5 +6,5 @@ use Respect\Validation\Validator as v;
 
 v::digit()->assert(1);
 v::digit()->check(1);
-
+?>
 --EXPECTF--
diff --git a/tests/integration/rules/digit_2.phpt b/tests/integration/rules/digit_2.phpt
index 57ab5da8..0a42f733 100644
--- a/tests/integration/rules/digit_2.phpt
+++ b/tests/integration/rules/digit_2.phpt
@@ -2,14 +2,14 @@
 <?php
 require 'vendor/autoload.php';
 
-use Respect\Validation\Validator as v;
 use Respect\Validation\Exceptions\DigitException;
+use Respect\Validation\Validator as v;
 
 try {
-	v::digit()->check('a');
-} catch(DigitException $e) {
-	echo $e->getMainMessage();
+    v::digit()->check('a');
+} catch (DigitException $e) {
+    echo $e->getMainMessage();
 }
-
+?>
 --EXPECTF--
 "a" must contain only digits (0-9)
diff --git a/tests/integration/rules/digit_3.phpt b/tests/integration/rules/digit_3.phpt
index bf9ed728..fd253137 100644
--- a/tests/integration/rules/digit_3.phpt
+++ b/tests/integration/rules/digit_3.phpt
@@ -2,14 +2,14 @@
 <?php
 require 'vendor/autoload.php';
 
-use Respect\Validation\Validator as v;
 use Respect\Validation\Exceptions\AllOfException;
+use Respect\Validation\Validator as v;
 
 try {
-	v::digit()->assert('a');
-} catch(AllOfException $e) {
-	echo $e->getFullMessage();
+    v::digit()->assert('a');
+} catch (AllOfException $e) {
+    echo $e->getFullMessage();
 }
-
+?>
 --EXPECTF--
 - "a" must contain only digits (0-9)
diff --git a/tests/integration/rules/digit_4.phpt b/tests/integration/rules/digit_4.phpt
index 8bd444eb..17ee5a2b 100644
--- a/tests/integration/rules/digit_4.phpt
+++ b/tests/integration/rules/digit_4.phpt
@@ -2,14 +2,14 @@
 <?php
 require 'vendor/autoload.php';
 
-use Respect\Validation\Validator as v;
 use Respect\Validation\Exceptions\DigitException;
+use Respect\Validation\Validator as v;
 
 try {
-	v::not(v::digit())->check(1);
-} catch(DigitException $e) {
-	echo $e->getMainMessage();
+    v::not(v::digit())->check(1);
+} catch (DigitException $e) {
+    echo $e->getMainMessage();
 }
-
+?>
 --EXPECTF--
 1 must not contain digits (0-9)
diff --git a/tests/integration/rules/digit_5.phpt b/tests/integration/rules/digit_5.phpt
index f3bd8d7a..ae2d4dc4 100644
--- a/tests/integration/rules/digit_5.phpt
+++ b/tests/integration/rules/digit_5.phpt
@@ -2,14 +2,14 @@
 <?php
 require 'vendor/autoload.php';
 
-use Respect\Validation\Validator as v;
 use Respect\Validation\Exceptions\AllOfException;
+use Respect\Validation\Validator as v;
 
 try {
-	v::not(v::digit())->assert(1);
-} catch(AllOfException $e) {
-	echo $e->getFullMessage();
+    v::not(v::digit())->assert(1);
+} catch (AllOfException $e) {
+    echo $e->getFullMessage();
 }
-
+?>
 --EXPECTF--
 - 1 must not contain digits (0-9)
diff --git a/tests/integration/rules/identityCard_3.phpt b/tests/integration/rules/identityCard_3.phpt
index 4d5cbd58..c0b18d07 100644
--- a/tests/integration/rules/identityCard_3.phpt
+++ b/tests/integration/rules/identityCard_3.phpt
@@ -3,13 +3,14 @@
 
 require_once 'vendor/autoload.php';
 
-use Respect\Validation\Validator as v;
 use Respect\Validation\Exceptions\AllOfException;
+use Respect\Validation\Validator as v;
 
 try {
-	v::identityCard('PL')->assert('AYE205411');
+    v::identityCard('PL')->assert('AYE205411');
 } catch (AllOfException $e) {
-	echo $e->getFullMessage();
+    echo $e->getFullMessage();
 }
+?>
 --EXPECTF--
 - "AYE205411" must be a valid Polish Identity Card number
diff --git a/tests/integration/rules/keyValue_3.phpt b/tests/integration/rules/keyValue_3.phpt
index a4e6b450..86558065 100644
--- a/tests/integration/rules/keyValue_3.phpt
+++ b/tests/integration/rules/keyValue_3.phpt
@@ -2,18 +2,18 @@
 <?php
 require 'vendor/autoload.php';
 
-use Respect\Validation\Validator as v;
 use Respect\Validation\Exceptions\AllOfException;
+use Respect\Validation\Validator as v;
 
-$data = array(
-	'password' => 'shazam',
-	'password_confirmation' => 'batman'
-);
+$data = [
+    'password' => 'shazam',
+    'password_confirmation' => 'batman',
+];
 
 try {
-	v::keyValue('password', 'equals', 'password_confirmation')->assert($data);
+    v::keyValue('password', 'equals', 'password_confirmation')->assert($data);
 } catch (AllOfException $e) {
-	echo $e->getMainMessage();
+    echo $e->getMainMessage();
 }
 --EXPECTF--
 All of the required rules must pass for { "password": "shazam", "password_confirmation": "batman" }
\ No newline at end of file
diff --git a/tests/integration/rules/keyValue_4.phpt b/tests/integration/rules/keyValue_4.phpt
index 0a6f48d1..3e80b660 100644
--- a/tests/integration/rules/keyValue_4.phpt
+++ b/tests/integration/rules/keyValue_4.phpt
@@ -3,17 +3,16 @@
 require 'vendor/autoload.php';
 
 use Respect\Validation\Validator as v;
-use Respect\Validation\Exceptions\KeyValuException;
 
-$data = array(
-	'password' => '123',
-	'invalid_passwords' => array('123', 'secreta')
-);
+$data = [
+    'password' => '123',
+    'invalid_passwords' => ['123', 'secreta'],
+];
 
 try {
-	v::not(v::keyValue('password', 'in', 'invalid_passwords'))->check($data);
+    v::not(v::keyValue('password', 'in', 'invalid_passwords'))->check($data);
 } catch (Exception $e) {
-	echo $e->getMainMessage();
+    echo $e->getMainMessage();
 }
 --EXPECTF--
 Key { "password": "123", "invalid_passwords": { "123", "secreta" } } must not be present
diff --git a/tests/integration/rules/keyValue_5.phpt b/tests/integration/rules/keyValue_5.phpt
index 818882f8..932e22b6 100644
--- a/tests/integration/rules/keyValue_5.phpt
+++ b/tests/integration/rules/keyValue_5.phpt
@@ -2,18 +2,18 @@
 <?php
 require 'vendor/autoload.php';
 
-use Respect\Validation\Validator as v;
 use Respect\Validation\Exceptions\AllOfException;
+use Respect\Validation\Validator as v;
 
-$data = array(
-	'password' => '123',
-	'invalid_passwords' => array('123', 'secreta')
-);
+$data = [
+    'password' => '123',
+    'invalid_passwords' => ['123', 'secreta'],
+];
 
 try {
-	v::not(v::keyValue('password', 'in', 'invalid_passwords'))->assert($data);
+    v::not(v::keyValue('password', 'in', 'invalid_passwords'))->assert($data);
 } catch (AllOfException $e) {
-	echo $e->getFullMessage();
+    echo $e->getFullMessage();
 }
 --EXPECTF--
 - Key { "password": "123", "invalid_passwords": { "123", "secreta" } } must not be present
diff --git a/tests/integration/rules/objectType_3.phpt b/tests/integration/rules/objectType_3.phpt
index 22b385a2..efb2cbcc 100644
--- a/tests/integration/rules/objectType_3.phpt
+++ b/tests/integration/rules/objectType_3.phpt
@@ -2,25 +2,14 @@
 <?php
 require 'vendor/autoload.php';
 
-use Respect\Validation\Validator as v;
-
-v::objectType()->assert(new stdClass);
-v::objectType()->check(new stdClass);
-?>
---EXPECTF--
---FILE--
-<?php
-require 'vendor/autoload.php';
-
-use Respect\Validation\Validator as v;
 use Respect\Validation\Exceptions\ObjectTypeException;
+use Respect\Validation\Validator as v;
 
 try {
-    v::not(v::objectType())->check(new stdClass);
+    v::not(v::objectType())->check(new stdClass());
 } catch (ObjectTypeException $exception) {
     echo $exception->getMainMessage();
 }
-
 ?>
 --EXPECTF--
-`[object] (stdClass: { })` must not be an object
\ No newline at end of file
+`[object] (stdClass: { })` must not be an object
diff --git a/tests/integration/rules/pesel_1.phpt b/tests/integration/rules/pesel_1.phpt
index 949c52ba..cb3231cb 100644
--- a/tests/integration/rules/pesel_1.phpt
+++ b/tests/integration/rules/pesel_1.phpt
@@ -7,5 +7,5 @@ use Respect\Validation\Validator as v;
 
 v::pesel()->check('21120209256');
 v::pesel()->assert('21120209256');
-
---EXPECTF--;
\ No newline at end of file
+?>
+--EXPECTF--;
diff --git a/tests/integration/rules/pesel_2.phpt b/tests/integration/rules/pesel_2.phpt
index 8e2b44ee..1a690cfa 100644
--- a/tests/integration/rules/pesel_2.phpt
+++ b/tests/integration/rules/pesel_2.phpt
@@ -3,15 +3,14 @@
 
 require_once 'vendor/autoload.php';
 
-use Respect\Validation\Validator as v;
 use Respect\Validation\Exceptions\PeselException;
+use Respect\Validation\Validator as v;
 
-try
-{
-	v::pesel()->check('21120209251');
+try {
+    v::pesel()->check('21120209251');
 } catch (PeselException $e) {
-	echo $e->getMainMessage();
+    echo $e->getMainMessage();
 }
-
+?>
 --EXPECTF--;
-"21120209251" must be a valid PESEL
\ No newline at end of file
+"21120209251" must be a valid PESEL
diff --git a/tests/integration/rules/pesel_3.phpt b/tests/integration/rules/pesel_3.phpt
index 793aae0e..2c644320 100644
--- a/tests/integration/rules/pesel_3.phpt
+++ b/tests/integration/rules/pesel_3.phpt
@@ -3,14 +3,14 @@
 
 require_once 'vendor/autoload.php';
 
-use Respect\Validation\Validator as v;
 use Respect\Validation\Exceptions\AllOfException;
+use Respect\Validation\Validator as v;
 
-try
-{
-	v::pesel()->assert('21120209251');
+try {
+    v::pesel()->assert('21120209251');
 } catch (AllOfException $e) {
-	echo $e->getFullMessage();
+    echo $e->getFullMessage();
 }
+?>
 --EXPECTF--
-- "21120209251" must be a valid PESEL
\ No newline at end of file
+- "21120209251" must be a valid PESEL
diff --git a/tests/integration/rules/pesel_4.phpt b/tests/integration/rules/pesel_4.phpt
index af12dcf9..9b545ae8 100644
--- a/tests/integration/rules/pesel_4.phpt
+++ b/tests/integration/rules/pesel_4.phpt
@@ -3,15 +3,14 @@
 
 require_once 'vendor/autoload.php';
 
-use Respect\Validation\Validator as v;
 use Respect\Validation\Exceptions\PeselException;
+use Respect\Validation\Validator as v;
 
-try
-{
-	v::not(v::pesel())->check('21120209256');
+try {
+    v::not(v::pesel())->check('21120209256');
 } catch (PeselException $e) {
-	echo $e->getMainMessage();
+    echo $e->getMainMessage();
 }
-
+?>
 --EXPECTF--
-"21120209256" must not be a valid PESEL
\ No newline at end of file
+"21120209256" must not be a valid PESEL
diff --git a/tests/integration/rules/pesel_5.phpt b/tests/integration/rules/pesel_5.phpt
index 33373177..e60b6a2a 100644
--- a/tests/integration/rules/pesel_5.phpt
+++ b/tests/integration/rules/pesel_5.phpt
@@ -3,15 +3,14 @@
 
 require_once 'vendor/autoload.php';
 
-use Respect\Validation\Validator as v;
 use Respect\Validation\Exceptions\AllOfException;
+use Respect\Validation\Validator as v;
 
-try
-{
-	v::not(v::pesel())->assert('21120209256');
+try {
+    v::not(v::pesel())->assert('21120209256');
 } catch (AllOfException $e) {
-	echo $e->getFullMessage();
+    echo $e->getFullMessage();
 }
-
+?>
 --EXPECTF--
-- "21120209256" must not be a valid PESEL
\ No newline at end of file
+- "21120209256" must not be a valid PESEL
diff --git a/tests/integration/rules/vatin_3.phpt b/tests/integration/rules/vatin_3.phpt
index 81f1fb0c..8ac39fe3 100644
--- a/tests/integration/rules/vatin_3.phpt
+++ b/tests/integration/rules/vatin_3.phpt
@@ -3,13 +3,14 @@
 
 require_once 'vendor/autoload.php';
 
-use Respect\Validation\Validator as v;
 use Respect\Validation\Exceptions\AllOfException;
+use Respect\Validation\Validator as v;
 
 try {
-	v::vatin('PL')->assert('1645865778');
+    v::vatin('PL')->assert('1645865778');
 } catch (AllOfException $e) {
-	echo $e->getFullMessage();
+    echo $e->getFullMessage();
 }
+?>
 --EXPECTF--
 - "1645865778" must be a valid Polish VAT identification number
diff --git a/tests/library/Rules/RuleTestCase.php b/tests/library/Rules/RuleTestCase.php
index c768cfbe..6f9c606f 100644
--- a/tests/library/Rules/RuleTestCase.php
+++ b/tests/library/Rules/RuleTestCase.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 use PHPUnit\Framework\TestCase;
@@ -81,7 +83,7 @@ abstract class RuleTestCase extends TestCase
      * @param Validatable $validator
      * @param mixed       $input
      */
-    public function testShouldValidateValidInput(Validatable $validator, $input)
+    public function testShouldValidateValidInput(Validatable $validator, $input): void
     {
         self::assertTrue($validator->validate($input));
     }
@@ -92,7 +94,7 @@ abstract class RuleTestCase extends TestCase
      * @param Validatable $validator
      * @param mixed       $input
      */
-    public function testShouldValidateInvalidInput(Validatable $validator, $input)
+    public function testShouldValidateInvalidInput(Validatable $validator, $input): void
     {
         self::assertFalse($validator->validate($input));
     }
diff --git a/tests/unit/Exceptions/CheckExceptionsTest.php b/tests/unit/Exceptions/CheckExceptionsTest.php
index cc089062..5818251f 100644
--- a/tests/unit/Exceptions/CheckExceptionsTest.php
+++ b/tests/unit/Exceptions/CheckExceptionsTest.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions;
 
 use DirectoryIterator;
@@ -31,7 +33,7 @@ class CheckExceptionsTest extends TestCase
 
             $ruleName = mb_substr($fileInfo->getBasename(), 0, -4);
             $ruleIsDeprecated = in_array($ruleName, $this->deprecateds);
-            $isRuleClassFile = (bool) ($fileInfo->getExtension() !== 'php');
+            $isRuleClassFile = (bool) ('php' !== $fileInfo->getExtension());
             if ($ruleIsDeprecated || $isRuleClassFile) {
                 continue;
             }
@@ -51,7 +53,7 @@ class CheckExceptionsTest extends TestCase
     /**
      * @dataProvider provideListOfRuleNames
      */
-    public function testRuleHasAnExceptionWhichHasValidApi($ruleName)
+    public function testRuleHasAnExceptionWhichHasValidApi($ruleName): void
     {
         $exceptionClass = 'Respect\\Validation\\Exceptions\\'.$ruleName.'Exception';
         self::assertTrue(
diff --git a/tests/unit/Exceptions/NestedValidationExceptionTest.php b/tests/unit/Exceptions/NestedValidationExceptionTest.php
index 7bd56c1e..3c14fa7b 100644
--- a/tests/unit/Exceptions/NestedValidationExceptionTest.php
+++ b/tests/unit/Exceptions/NestedValidationExceptionTest.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions;
 
 use PHPUnit\Framework\TestCase;
@@ -23,7 +25,7 @@ class PrivateNestedValidationException extends NestedValidationException
 
 class NestedValidationExceptionTest extends TestCase
 {
-    public function testGetRelatedShouldReturnExceptionAddedByAddRelated()
+    public function testGetRelatedShouldReturnExceptionAddedByAddRelated(): void
     {
         $composite = new AttributeException();
         $node = new IntValException();
@@ -32,7 +34,7 @@ class NestedValidationExceptionTest extends TestCase
         self::assertContainsOnly($node, $composite->getRelated());
     }
 
-    public function testAddingTheSameInstanceShouldAddJustASingleReference()
+    public function testAddingTheSameInstanceShouldAddJustASingleReference(): void
     {
         $composite = new AttributeException();
         $node = new IntValException();
@@ -43,7 +45,7 @@ class NestedValidationExceptionTest extends TestCase
         self::assertContainsOnly($node, $composite->getRelated());
     }
 
-    public function testFindRelatedShouldFindCompositeExceptions()
+    public function testFindRelatedShouldFindCompositeExceptions(): void
     {
         $foo = new AttributeException();
         $bar = new AttributeException();
diff --git a/tests/unit/Exceptions/ValidationExceptionTest.php b/tests/unit/Exceptions/ValidationExceptionTest.php
index 61bd46ca..5496684a 100644
--- a/tests/unit/Exceptions/ValidationExceptionTest.php
+++ b/tests/unit/Exceptions/ValidationExceptionTest.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Exceptions;
 
 use ArrayIterator;
@@ -20,7 +22,7 @@ use stdClass;
 
 class ValidationExceptionTest extends TestCase
 {
-    public function testItImplementsExceptionInterface()
+    public function testItImplementsExceptionInterface(): void
     {
         $validationException = new ValidationException();
         self::assertInstanceOf(ExceptionInterface::class, $validationException);
@@ -29,7 +31,7 @@ class ValidationExceptionTest extends TestCase
     /**
      * @dataProvider providerForFormat
      */
-    public function testFormatShouldReplacePlaceholdersProperly($template, $result, $vars)
+    public function testFormatShouldReplacePlaceholdersProperly($template, $result, $vars): void
     {
         self::assertEquals(
             $result,
@@ -40,7 +42,7 @@ class ValidationExceptionTest extends TestCase
     /**
      * @dataProvider providerForStringify
      */
-    public function testStringifyShouldConvertStringsProperly($input, $result)
+    public function testStringifyShouldConvertStringsProperly($input, $result): void
     {
         self::assertStringMatchesFormat(
             $result,
@@ -48,7 +50,7 @@ class ValidationExceptionTest extends TestCase
         );
     }
 
-    public function testGetMainMessageShouldApplyTemplatePlaceholders()
+    public function testGetMainMessageShouldApplyTemplatePlaceholders(): void
     {
         $sampleValidationException = new ValidationException();
         $sampleValidationException->configure('foo', ['bar' => 1, 'baz' => 2]);
@@ -59,7 +61,7 @@ class ValidationExceptionTest extends TestCase
         );
     }
 
-    public function testSettingTemplates()
+    public function testSettingTemplates(): void
     {
         $x = new ValidationException();
         $x->configure('bar');
diff --git a/tests/unit/FactoryTest.php b/tests/unit/FactoryTest.php
index 1965b881..0653eb06 100644
--- a/tests/unit/FactoryTest.php
+++ b/tests/unit/FactoryTest.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation;
 
 use PHPUnit\Framework\TestCase;
@@ -19,7 +21,7 @@ use Respect\Validation\Rules\Uppercase;
  */
 class FactoryTest extends TestCase
 {
-    public function testShouldHaveRulePrefixesByDefault()
+    public function testShouldHaveRulePrefixesByDefault(): void
     {
         $factory = new Factory();
 
@@ -29,7 +31,7 @@ class FactoryTest extends TestCase
     /**
      * @dataProvider provideRulePrefixes
      */
-    public function testShouldBeAbleToAppendANewPrefix($namespace, $expectedNamespace)
+    public function testShouldBeAbleToAppendANewPrefix($namespace, $expectedNamespace): void
     {
         $factory = new Factory();
         $factory->appendRulePrefix($namespace);
@@ -51,7 +53,7 @@ class FactoryTest extends TestCase
     /**
      * @dataProvider provideRulePrefixes
      */
-    public function testShouldBeAbleToPrependANewRulePrefix($namespace, $expectedNamespace)
+    public function testShouldBeAbleToPrependANewRulePrefix($namespace, $expectedNamespace): void
     {
         $factory = new Factory();
         $factory->prependRulePrefix($namespace);
@@ -84,14 +86,14 @@ class FactoryTest extends TestCase
         ];
     }
 
-    public function testShouldCreateARuleByName()
+    public function testShouldCreateARuleByName(): void
     {
         $factory = new Factory();
 
         self::assertInstanceOf(Uppercase::class, $factory->rule('uppercase'));
     }
 
-    public function testShouldDefineConstructorArgumentsWhenCreatingARule()
+    public function testShouldDefineConstructorArgumentsWhenCreatingARule(): void
     {
         $factory = new Factory();
         $rule = $factory->rule('dateTime', ['Y-m-d']);
@@ -103,7 +105,7 @@ class FactoryTest extends TestCase
      * @expectedException \Respect\Validation\Exceptions\ComponentException
      * @expectedExceptionMessage "uterere" is not a valid rule name
      */
-    public function testShouldThrowsAnExceptionWhenRuleNameIsNotValid()
+    public function testShouldThrowsAnExceptionWhenRuleNameIsNotValid(): void
     {
         $factory = new Factory();
         $factory->rule('uterere');
@@ -113,7 +115,7 @@ class FactoryTest extends TestCase
      * @expectedException \Respect\Validation\Exceptions\ComponentException
      * @expectedExceptionMessage "Respect\Validation\Exceptions\AgeException" is not a valid respect rule
      */
-    public function testShouldThrowsAnExceptionWhenRuleIsNotInstanceOfRuleInterface()
+    public function testShouldThrowsAnExceptionWhenRuleIsNotInstanceOfRuleInterface(): void
     {
         $factory = new Factory();
         $factory->appendRulePrefix('Respect\\Validation\\Exceptions\\');
diff --git a/tests/unit/Rules/AbstractCompositeTest.php b/tests/unit/Rules/AbstractCompositeTest.php
index 9ee4e0f8..d3627740 100644
--- a/tests/unit/Rules/AbstractCompositeTest.php
+++ b/tests/unit/Rules/AbstractCompositeTest.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 use PHPUnit\Framework\TestCase;
@@ -16,7 +18,7 @@ use Respect\Validation\Validatable;
 
 class AbstractCompositeTest extends TestCase
 {
-    public function testShouldDefineNameForInternalWhenAppendRuleToCompositeRule()
+    public function testShouldDefineNameForInternalWhenAppendRuleToCompositeRule(): void
     {
         $ruleName = 'something';
 
@@ -38,7 +40,7 @@ class AbstractCompositeTest extends TestCase
         $compositeRuleMock->addRule($simpleRuleMock);
     }
 
-    public function testShouldUpdateInternalRuleNameWhenNameIsUpdated()
+    public function testShouldUpdateInternalRuleNameWhenNameIsUpdated(): void
     {
         $ruleName1 = 'something';
         $ruleName2 = 'something else';
@@ -70,7 +72,7 @@ class AbstractCompositeTest extends TestCase
         $compositeRuleMock->setName($ruleName2);
     }
 
-    public function testShouldNotUpdateInternalRuleAlreadyHasAName()
+    public function testShouldNotUpdateInternalRuleAlreadyHasAName(): void
     {
         $simpleRuleMock = $this->createMock(Validatable::class);
         $simpleRuleMock
@@ -89,7 +91,7 @@ class AbstractCompositeTest extends TestCase
         $compositeRuleMock->setName('Whatever');
     }
 
-    public function testShouldUpdateInternalRuleWhenItsNameIsNull()
+    public function testShouldUpdateInternalRuleWhenItsNameIsNull(): void
     {
         $ruleName = 'something';
 
@@ -111,7 +113,7 @@ class AbstractCompositeTest extends TestCase
         $compositeRuleMock->setName($ruleName);
     }
 
-    public function testShouldDefineNameForInternalRulesWhenItHasNotAName()
+    public function testShouldDefineNameForInternalRulesWhenItHasNotAName(): void
     {
         $ruleName = 'something';
 
@@ -133,7 +135,7 @@ class AbstractCompositeTest extends TestCase
         $compositeRuleMock->setName($ruleName);
     }
 
-    public function testShouldNotDefineNameForInternalRulesWhenItHasAName()
+    public function testShouldNotDefineNameForInternalRulesWhenItHasAName(): void
     {
         $ruleName = 'something';
 
@@ -154,7 +156,7 @@ class AbstractCompositeTest extends TestCase
         $compositeRuleMock->setName($ruleName);
     }
 
-    public function testRemoveRulesShouldRemoveAllTheAddedRules()
+    public function testRemoveRulesShouldRemoveAllTheAddedRules(): void
     {
         $simpleRuleMock = $this->createMock(Validatable::class);
 
@@ -165,7 +167,7 @@ class AbstractCompositeTest extends TestCase
         self::assertEmpty($compositeRuleMock->getRules());
     }
 
-    public function testShouldReturnTheAmountOfAddedRules()
+    public function testShouldReturnTheAmountOfAddedRules(): void
     {
         $compositeRuleMock = $this->getMockForAbstractClass(AbstractComposite::class);
         $compositeRuleMock->addRule($this->createMock(Validatable::class));
@@ -175,14 +177,14 @@ class AbstractCompositeTest extends TestCase
         self::assertCount(3, $compositeRuleMock->getRules());
     }
 
-    public function testHasRuleShouldReturnFalseWhenThereIsNoRuleAppended()
+    public function testHasRuleShouldReturnFalseWhenThereIsNoRuleAppended(): void
     {
         $compositeRuleMock = $this->getMockForAbstractClass(AbstractComposite::class);
 
         self::assertFalse($compositeRuleMock->hasRule(''));
     }
 
-    public function testHasRuleShouldReturnFalseWhenRuleIsNotFound()
+    public function testHasRuleShouldReturnFalseWhenRuleIsNotFound(): void
     {
         $oneSimpleRuleMock = $this->createMock(Validatable::class);
 
@@ -194,7 +196,7 @@ class AbstractCompositeTest extends TestCase
         self::assertFalse($compositeRuleMock->hasRule($anotherSimpleRuleMock));
     }
 
-    public function testHasRuleShouldReturnFalseWhenRulePassedAsStringIsNotFound()
+    public function testHasRuleShouldReturnFalseWhenRulePassedAsStringIsNotFound(): void
     {
         $simpleRuleMock = $this->createMock(Validatable::class);
 
@@ -204,7 +206,7 @@ class AbstractCompositeTest extends TestCase
         self::assertFalse($compositeRuleMock->hasRule('SomeRule'));
     }
 
-    public function testHasRuleShouldReturnTrueWhenRuleIsFound()
+    public function testHasRuleShouldReturnTrueWhenRuleIsFound(): void
     {
         $simpleRuleMock = $this->createMock(Validatable::class);
 
@@ -214,7 +216,7 @@ class AbstractCompositeTest extends TestCase
         self::assertTrue($compositeRuleMock->hasRule($simpleRuleMock));
     }
 
-    public function testShouldAddRulesByPassingThroughConstructor()
+    public function testShouldAddRulesByPassingThroughConstructor(): void
     {
         $simpleRuleMock = $this->createMock(Validatable::class);
         $anotherSimpleRuleMock = $this->createMock(Validatable::class);
diff --git a/tests/unit/Rules/AbstractCtypeRuleTest.php b/tests/unit/Rules/AbstractCtypeRuleTest.php
index 122b143b..96b849f0 100644
--- a/tests/unit/Rules/AbstractCtypeRuleTest.php
+++ b/tests/unit/Rules/AbstractCtypeRuleTest.php
@@ -9,13 +9,15 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 use PHPUnit\Framework\TestCase;
 
 class AbstractCtypeRuleTest extends TestCase
 {
-    public function testValidateCleanShouldReturnTrueWhenCtypeFunctionReturnsTrue()
+    public function testValidateCleanShouldReturnTrueWhenCtypeFunctionReturnsTrue(): void
     {
         $ctypeRuleMock = $this->getMockForAbstractClass(AbstractCtypeRule::class);
         $ctypeRuleMock->expects($this->once())
@@ -25,7 +27,7 @@ class AbstractCtypeRuleTest extends TestCase
         self::assertTrue($ctypeRuleMock->validateClean('anything'));
     }
 
-    public function testValidateCleanShouldReturnFalseWhenCtypeFunctionReturnsFalse()
+    public function testValidateCleanShouldReturnFalseWhenCtypeFunctionReturnsFalse(): void
     {
         $ctypeRuleMock = $this->getMockForAbstractClass(AbstractCtypeRule::class);
         $ctypeRuleMock->expects($this->once())
diff --git a/tests/unit/Rules/AbstractFilterRuleTest.php b/tests/unit/Rules/AbstractFilterRuleTest.php
index 3776617e..0a0fc006 100644
--- a/tests/unit/Rules/AbstractFilterRuleTest.php
+++ b/tests/unit/Rules/AbstractFilterRuleTest.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 use PHPUnit\Framework\TestCase;
@@ -19,12 +21,12 @@ class AbstractFilterRuleTest extends TestCase
      * @expectedException \Respect\Validation\Exceptions\ComponentException
      * @expectedExceptionMessage Invalid list of additional characters to be loaded
      */
-    public function testConstructorShouldThrowExceptionIfParamIsNotString()
+    public function testConstructorShouldThrowExceptionIfParamIsNotString(): void
     {
         $this->getMockForAbstractClass(AbstractFilterRule::class, [1]);
     }
 
-    public function testValidateShouldReturnTrueForValidArguments()
+    public function testValidateShouldReturnTrueForValidArguments(): void
     {
         $filterRuleMock = $this->getMockForAbstractClass(AbstractFilterRule::class);
         $filterRuleMock->expects($this->any())
@@ -34,7 +36,7 @@ class AbstractFilterRuleTest extends TestCase
         self::assertTrue($filterRuleMock->validate('hey'));
     }
 
-    public function testValidateShouldReturnFalseForInvalidArguments()
+    public function testValidateShouldReturnFalseForInvalidArguments(): void
     {
         $filterRuleMock = $this->getMockForAbstractClass(AbstractFilterRule::class);
         $filterRuleMock->expects($this->any())
diff --git a/tests/unit/Rules/AbstractRegexRuleTest.php b/tests/unit/Rules/AbstractRegexRuleTest.php
index ba95ab60..4cbc8023 100644
--- a/tests/unit/Rules/AbstractRegexRuleTest.php
+++ b/tests/unit/Rules/AbstractRegexRuleTest.php
@@ -9,13 +9,15 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 use PHPUnit\Framework\TestCase;
 
 class AbstractRegexRuleTest extends TestCase
 {
-    public function testValidateCleanShouldReturnOneIfPatternIsFound()
+    public function testValidateCleanShouldReturnOneIfPatternIsFound(): void
     {
         $regexRuleMock = $this->getMockForAbstractClass(AbstractRegexRule::class);
         $regexRuleMock->expects($this->once())
@@ -25,7 +27,7 @@ class AbstractRegexRuleTest extends TestCase
         self::assertEquals(1, $regexRuleMock->validateClean('Respect'));
     }
 
-    public function testValidateCleanShouldReturnZeroIfPatternIsNotFound()
+    public function testValidateCleanShouldReturnZeroIfPatternIsNotFound(): void
     {
         $regexRuleMock = $this->getMockForAbstractClass(AbstractRegexRule::class);
         $regexRuleMock->expects($this->once())
diff --git a/tests/unit/Rules/AbstractRelatedTest.php b/tests/unit/Rules/AbstractRelatedTest.php
index 9d9b9544..e20c69d8 100644
--- a/tests/unit/Rules/AbstractRelatedTest.php
+++ b/tests/unit/Rules/AbstractRelatedTest.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 use PHPUnit\Framework\TestCase;
@@ -25,7 +27,7 @@ final class AbstractRelatedTest extends TestCase
         ];
     }
 
-    public function testConstructionOfAbstractRelatedClass()
+    public function testConstructionOfAbstractRelatedClass(): void
     {
         $validatableMock = $this->createMock(Validatable::class);
         $relatedRuleMock = $this->getMockForAbstractClass(AbstractRelated::class, ['foo', $validatableMock]);
@@ -39,7 +41,7 @@ final class AbstractRelatedTest extends TestCase
     /**
      * @dataProvider providerForOperations
      */
-    public function testOperationsShouldReturnTrueWhenReferenceValidatesItsValue($method)
+    public function testOperationsShouldReturnTrueWhenReferenceValidatesItsValue($method): void
     {
         $validatableMock = $this->createMock(Validatable::class);
         $validatableMock->expects($this->any())
@@ -54,7 +56,7 @@ final class AbstractRelatedTest extends TestCase
         self::assertTrue($relatedRuleMock->$method('foo'));
     }
 
-    public function testValidateShouldReturnFalseWhenIsMandatoryAndThereIsNoReference()
+    public function testValidateShouldReturnFalseWhenIsMandatoryAndThereIsNoReference(): void
     {
         $relatedRuleMock = $this->getMockForAbstractClass(AbstractRelated::class, ['foo']);
         $relatedRuleMock->expects($this->any())
@@ -64,7 +66,7 @@ final class AbstractRelatedTest extends TestCase
         self::assertFalse($relatedRuleMock->validate('foo'));
     }
 
-    public function testShouldAcceptReferenceOnConstructor()
+    public function testShouldAcceptReferenceOnConstructor(): void
     {
         $reference = 'something';
 
@@ -76,7 +78,7 @@ final class AbstractRelatedTest extends TestCase
         self::assertSame($reference, $abstractMock->reference);
     }
 
-    public function testShouldBeMandatoryByDefault()
+    public function testShouldBeMandatoryByDefault(): void
     {
         $abstractMock = $this
             ->getMockBuilder(AbstractRelated::class)
@@ -86,7 +88,7 @@ final class AbstractRelatedTest extends TestCase
         self::assertTrue($abstractMock->mandatory);
     }
 
-    public function testShouldAcceptReferenceAndRuleOnConstructor()
+    public function testShouldAcceptReferenceAndRuleOnConstructor(): void
     {
         $ruleMock = $this->createMock(Validatable::class);
 
@@ -98,7 +100,7 @@ final class AbstractRelatedTest extends TestCase
         self::assertSame($ruleMock, $abstractMock->validator);
     }
 
-    public function testShouldDefineRuleNameAsReferenceWhenRuleDoesNotHaveAName()
+    public function testShouldDefineRuleNameAsReferenceWhenRuleDoesNotHaveAName(): void
     {
         $reference = 'something';
 
@@ -120,7 +122,7 @@ final class AbstractRelatedTest extends TestCase
         self::assertSame($ruleMock, $abstractMock->validator);
     }
 
-    public function testShouldNotDefineRuleNameAsReferenceWhenRuleDoesHaveAName()
+    public function testShouldNotDefineRuleNameAsReferenceWhenRuleDoesHaveAName(): void
     {
         $reference = 'something';
 
@@ -141,7 +143,7 @@ final class AbstractRelatedTest extends TestCase
         self::assertSame($ruleMock, $abstractMock->validator);
     }
 
-    public function testShouldAcceptMandatoryFlagOnConstructor()
+    public function testShouldAcceptMandatoryFlagOnConstructor(): void
     {
         $mandatory = false;
 
@@ -153,7 +155,7 @@ final class AbstractRelatedTest extends TestCase
         self::assertSame($mandatory, $abstractMock->mandatory);
     }
 
-    public function testShouldDefineChildNameWhenDefiningTheNameOfTheParent()
+    public function testShouldDefineChildNameWhenDefiningTheNameOfTheParent(): void
     {
         $name = 'My new name';
         $reference = 'something';
diff --git a/tests/unit/Rules/AbstractRuleTest.php b/tests/unit/Rules/AbstractRuleTest.php
index 1f97d124..ed3c26a9 100644
--- a/tests/unit/Rules/AbstractRuleTest.php
+++ b/tests/unit/Rules/AbstractRuleTest.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 use PHPUnit\Framework\TestCase;
@@ -28,7 +30,7 @@ class AbstractRuleTest extends TestCase
      * @dataProvider providerForTrueAndFalse
      * @covers       \Respect\Validation\Rules\AbstractRule::__invoke
      */
-    public function testMagicMethodInvokeCallsValidateWithInput($booleanResult)
+    public function testMagicMethodInvokeCallsValidateWithInput($booleanResult): void
     {
         $input = 'something';
 
@@ -54,7 +56,7 @@ class AbstractRuleTest extends TestCase
     /**
      * @covers \Respect\Validation\Rules\AbstractRule::assert
      */
-    public function testAssertInvokesValidateOnSuccess()
+    public function testAssertInvokesValidateOnSuccess(): void
     {
         $input = 'something';
 
@@ -80,7 +82,7 @@ class AbstractRuleTest extends TestCase
      * @covers            \Respect\Validation\Rules\AbstractRule::assert
      * @expectedException \Respect\Validation\Exceptions\ValidationException
      */
-    public function testAssertInvokesValidateAndReportErrorOnFailure()
+    public function testAssertInvokesValidateAndReportErrorOnFailure(): void
     {
         $input = 'something';
 
@@ -107,7 +109,7 @@ class AbstractRuleTest extends TestCase
     /**
      * @covers \Respect\Validation\Rules\AbstractRule::check
      */
-    public function testCheckInvokesAssertToPerformTheValidationByDefault()
+    public function testCheckInvokesAssertToPerformTheValidationByDefault(): void
     {
         $input = 'something';
 
@@ -153,7 +155,7 @@ class AbstractRuleTest extends TestCase
      * @covers \Respect\Validation\Rules\AbstractRule::reportError
      * @covers \Respect\Validation\Rules\AbstractRule::setTemplate
      */
-    public function testShouldUseDefinedTemplateOnCreatedException()
+    public function testShouldUseDefinedTemplateOnCreatedException(): void
     {
         $template = 'This is my template';
 
@@ -184,7 +186,7 @@ class AbstractRuleTest extends TestCase
     /**
      * @covers \Respect\Validation\Rules\AbstractRule::setTemplate
      */
-    public function testShouldReturnTheCurrentObjectWhenDefinigTemplate()
+    public function testShouldReturnTheCurrentObjectWhenDefinigTemplate(): void
     {
         $abstractRuleMock = $this
             ->getMockBuilder(AbstractRule::class)
@@ -196,7 +198,7 @@ class AbstractRuleTest extends TestCase
     /**
      * @covers \Respect\Validation\Rules\AbstractRule::setName
      */
-    public function testShouldReturnTheCurrentObjectWhenDefinigName()
+    public function testShouldReturnTheCurrentObjectWhenDefinigName(): void
     {
         $abstractRuleMock = $this
             ->getMockBuilder(AbstractRule::class)
@@ -209,7 +211,7 @@ class AbstractRuleTest extends TestCase
      * @covers \Respect\Validation\Rules\AbstractRule::setName
      * @covers \Respect\Validation\Rules\AbstractRule::getName
      */
-    public function testShouldBeAbleToDefineAndRetrivedRuleName()
+    public function testShouldBeAbleToDefineAndRetrivedRuleName(): void
     {
         $abstractRuleMock = $this
             ->getMockBuilder(AbstractRule::class)
diff --git a/tests/unit/Rules/AbstractSearcherTest.php b/tests/unit/Rules/AbstractSearcherTest.php
index b1d20dee..ce012b75 100644
--- a/tests/unit/Rules/AbstractSearcherTest.php
+++ b/tests/unit/Rules/AbstractSearcherTest.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 use PHPUnit\Framework\TestCase;
@@ -17,12 +19,12 @@ class AbstractSearcherTest extends TestCase
 {
     protected $searcherRuleMock;
 
-    protected function setUp()
+    protected function setUp(): void
     {
         $this->searcherRuleMock = $this->getMockForAbstractClass(AbstractSearcher::class);
     }
 
-    public function testValidateShouldReturnTrueWhenEqualValueIsFoundInHaystack()
+    public function testValidateShouldReturnTrueWhenEqualValueIsFoundInHaystack(): void
     {
         $this->searcherRuleMock->haystack = [1, 2, 3, 4];
 
@@ -30,14 +32,14 @@ class AbstractSearcherTest extends TestCase
         self::assertTrue($this->searcherRuleMock->validate(1));
     }
 
-    public function testValidateShouldReturnFalseWhenEqualValueIsNotFoundInHaystack()
+    public function testValidateShouldReturnFalseWhenEqualValueIsNotFoundInHaystack(): void
     {
         $this->searcherRuleMock->haystack = [1, 2, 3, 4];
 
         self::assertFalse($this->searcherRuleMock->validate(5));
     }
 
-    public function testValidateShouldReturnTrueWhenIdenticalValueIsFoundInHaystack()
+    public function testValidateShouldReturnTrueWhenIdenticalValueIsFoundInHaystack(): void
     {
         $this->searcherRuleMock->haystack = [1, 2, 3, 4];
         $this->searcherRuleMock->compareIdentical = true;
@@ -46,7 +48,7 @@ class AbstractSearcherTest extends TestCase
         self::assertTrue($this->searcherRuleMock->validate(4));
     }
 
-    public function testValidateShouldReturnFalseWhenIdenticalValueIsNotFoundInHaystack()
+    public function testValidateShouldReturnFalseWhenIdenticalValueIsNotFoundInHaystack(): void
     {
         $this->searcherRuleMock->haystack = [1, 2, 3, 4];
         $this->searcherRuleMock->compareIdentical = true;
@@ -56,7 +58,7 @@ class AbstractSearcherTest extends TestCase
         self::assertFalse($this->searcherRuleMock->validate(5));
     }
 
-    public function testValidateShouldReturnTrueWhenInputIsEmptyOrNullAndIdenticalToHaystack()
+    public function testValidateShouldReturnTrueWhenInputIsEmptyOrNullAndIdenticalToHaystack(): void
     {
         $this->searcherRuleMock->compareIdentical = true;
 
@@ -67,7 +69,7 @@ class AbstractSearcherTest extends TestCase
         self::assertTrue($this->searcherRuleMock->validate(''));
     }
 
-    public function testValidateShouldReturnFalseWhenInputIsEmptyOrNullAndNotIdenticalToHaystack()
+    public function testValidateShouldReturnFalseWhenInputIsEmptyOrNullAndNotIdenticalToHaystack(): void
     {
         $this->searcherRuleMock->compareIdentical = true;
 
@@ -78,13 +80,13 @@ class AbstractSearcherTest extends TestCase
         self::assertFalse($this->searcherRuleMock->validate(null));
     }
 
-    public function testValidateShouldReturnTrueWhenInputIsEmptyOrNullAndEqualsHaystack()
+    public function testValidateShouldReturnTrueWhenInputIsEmptyOrNullAndEqualsHaystack(): void
     {
         self::assertTrue($this->searcherRuleMock->validate(''));
         self::assertTrue($this->searcherRuleMock->validate(null));
     }
 
-    public function testValidateShouldReturnFalseWhenInputIsEmptyOrNullAndNotEqualsHaystack()
+    public function testValidateShouldReturnFalseWhenInputIsEmptyOrNullAndNotEqualsHaystack(): void
     {
         $this->searcherRuleMock->haystack = 'Respect';
 
@@ -92,7 +94,7 @@ class AbstractSearcherTest extends TestCase
         self::assertFalse($this->searcherRuleMock->validate(null));
     }
 
-    public function testValidateWhenHaystackIsNotArrayAndInputIsPartOfHaystack()
+    public function testValidateWhenHaystackIsNotArrayAndInputIsPartOfHaystack(): void
     {
         $this->searcherRuleMock->haystack = 'Respect';
 
diff --git a/tests/unit/Rules/AbstractWrapperTest.php b/tests/unit/Rules/AbstractWrapperTest.php
index c409797a..558a12b6 100644
--- a/tests/unit/Rules/AbstractWrapperTest.php
+++ b/tests/unit/Rules/AbstractWrapperTest.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 use PHPUnit\Framework\TestCase;
@@ -21,13 +23,13 @@ class AbstractWrapperTest extends TestCase
      * @expectedException \Respect\Validation\Exceptions\ComponentException
      * @expectedExceptionMessage There is no defined validatable
      */
-    public function testShouldThrowsAnExceptionWhenWrappedValidatableIsNotDefined()
+    public function testShouldThrowsAnExceptionWhenWrappedValidatableIsNotDefined(): void
     {
         $wrapper = $this->getMockForAbstractClass(AbstractWrapper::class);
         $wrapper->getValidatable();
     }
 
-    private function bindValidatable($wrapper, $validatable)
+    private function bindValidatable($wrapper, $validatable): void
     {
         $reflectionObject = new ReflectionObject($wrapper);
         $reflectionProperty = $reflectionObject->getProperty('validatable');
@@ -35,7 +37,7 @@ class AbstractWrapperTest extends TestCase
         $reflectionProperty->setValue($wrapper, $validatable);
     }
 
-    public function testShouldReturnDefinedValidatable()
+    public function testShouldReturnDefinedValidatable(): void
     {
         $validatable = $this->createMock(Validatable::class);
 
@@ -45,7 +47,7 @@ class AbstractWrapperTest extends TestCase
         self::assertSame($validatable, $wrapper->getValidatable());
     }
 
-    public function testShouldUseWrappedToValidate()
+    public function testShouldUseWrappedToValidate(): void
     {
         $input = 'Whatever';
 
@@ -62,7 +64,7 @@ class AbstractWrapperTest extends TestCase
         self::assertTrue($wrapper->validate($input));
     }
 
-    public function testShouldUseWrappedToAssert()
+    public function testShouldUseWrappedToAssert(): void
     {
         $input = 'Whatever';
 
@@ -79,7 +81,7 @@ class AbstractWrapperTest extends TestCase
         self::assertTrue($wrapper->assert($input));
     }
 
-    public function testShouldUseWrappedToCheck()
+    public function testShouldUseWrappedToCheck(): void
     {
         $input = 'Whatever';
 
@@ -96,7 +98,7 @@ class AbstractWrapperTest extends TestCase
         self::assertTrue($wrapper->check($input));
     }
 
-    public function testShouldPassNameOnToWrapped()
+    public function testShouldPassNameOnToWrapped(): void
     {
         $name = 'Whatever';
 
diff --git a/tests/unit/Rules/AgeTest.php b/tests/unit/Rules/AgeTest.php
index 62d2e266..91be5ae3 100644
--- a/tests/unit/Rules/AgeTest.php
+++ b/tests/unit/Rules/AgeTest.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 use DateTime;
@@ -25,15 +27,16 @@ class AgeTest extends TestCase
      * @expectedException \Respect\Validation\Exceptions\ComponentException
      * @expectedExceptionMessage An age interval must be provided
      */
-    public function testShouldThrowsExceptionWhenThereIsNoArgumentsOnConstructor()
+    public function testShouldThrowsExceptionWhenThereIsNoArgumentsOnConstructor(): void
     {
         new Age();
     }
+
     /**
      * @expectedException \Respect\Validation\Exceptions\ComponentException
      * @expectedExceptionMessage 20 cannot be greater than or equals to 10
      */
-    public function testShouldThrowsExceptionWhenMinimumAgeIsLessThenMaximumAge()
+    public function testShouldThrowsExceptionWhenMinimumAgeIsLessThenMaximumAge(): void
     {
         new Age(20, 10);
     }
@@ -42,7 +45,7 @@ class AgeTest extends TestCase
      * @expectedException \Respect\Validation\Exceptions\ComponentException
      * @expectedExceptionMessage 20 cannot be greater than or equals to 20
      */
-    public function testShouldThrowsExceptionWhenMinimumAgeIsEqualsToMaximumAge()
+    public function testShouldThrowsExceptionWhenMinimumAgeIsEqualsToMaximumAge(): void
     {
         new Age(20, 20);
     }
@@ -70,7 +73,7 @@ class AgeTest extends TestCase
     /**
      * @dataProvider providerForValidAge
      */
-    public function testShouldValidateValidAge($minAge, $maxAge, $input)
+    public function testShouldValidateValidAge($minAge, $maxAge, $input): void
     {
         $rule = new Age($minAge, $maxAge);
 
@@ -96,7 +99,7 @@ class AgeTest extends TestCase
     /**
      * @dataProvider providerForInvalidAge
      */
-    public function testShouldValidateInvalidAge($minAge, $maxAge, $input)
+    public function testShouldValidateInvalidAge($minAge, $maxAge, $input): void
     {
         $rule = new Age($minAge, $maxAge);
 
@@ -109,7 +112,7 @@ class AgeTest extends TestCase
      * @expectedException \Respect\Validation\Exceptions\AgeException
      * @expectedExceptionMessage "today" must be lower than 18 years ago
      */
-    public function testShouldThrowsExceptionWhenMinimumAgeFails()
+    public function testShouldThrowsExceptionWhenMinimumAgeFails(): void
     {
         $rule = new Age(18);
         $rule->assert('today');
@@ -121,7 +124,7 @@ class AgeTest extends TestCase
      * @expectedException \Respect\Validation\Exceptions\AgeException
      * @expectedExceptionMessage "51 years ago" must be greater than 50 years ago
      */
-    public function testShouldThrowsExceptionWhenMaximunAgeFails()
+    public function testShouldThrowsExceptionWhenMaximunAgeFails(): void
     {
         $rule = new Age(null, 50);
         $rule->assert('51 years ago');
@@ -133,7 +136,7 @@ class AgeTest extends TestCase
      * @expectedException \Respect\Validation\Exceptions\AgeException
      * @expectedExceptionMessage "today" must be between 18 and 50 years ago
      */
-    public function testShouldThrowsExceptionWhenMinimunAndMaximunAgeFails()
+    public function testShouldThrowsExceptionWhenMinimunAndMaximunAgeFails(): void
     {
         $rule = new Age(18, 50);
         $rule->assert('today');
diff --git a/tests/unit/Rules/AllOfTest.php b/tests/unit/Rules/AllOfTest.php
index 6f0809e8..7fca7bff 100644
--- a/tests/unit/Rules/AllOfTest.php
+++ b/tests/unit/Rules/AllOfTest.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 use PHPUnit\Framework\TestCase;
@@ -20,14 +22,14 @@ use PHPUnit\Framework\TestCase;
  */
 class AllOfTest extends TestCase
 {
-    public function testRemoveRulesShouldRemoveAllRules()
+    public function testRemoveRulesShouldRemoveAllRules(): void
     {
         $o = new AllOf(new IntVal(), new Positive());
         $o->removeRules();
         self::assertEquals(0, count($o->getRules()));
     }
 
-    public function testAddRulesUsingArrayOfRules()
+    public function testAddRulesUsingArrayOfRules(): void
     {
         $o = new AllOf();
         $o->addRules(
@@ -39,14 +41,14 @@ class AllOfTest extends TestCase
         self::assertTrue($o->hasRule('Positive'));
     }
 
-    public function testAddRulesUsingSpecificationArray()
+    public function testAddRulesUsingSpecificationArray(): void
     {
         $o = new AllOf();
         $o->addRules(['Between' => [1, 2]]);
         self::assertTrue($o->hasRule('Between'));
     }
 
-    public function testValidationShouldWorkIfAllRulesReturnTrue()
+    public function testValidationShouldWorkIfAllRulesReturnTrue(): void
     {
         $valid1 = new Callback(function () {
             return true;
@@ -70,7 +72,7 @@ class AllOfTest extends TestCase
      * @dataProvider providerStaticDummyRules
      * @expectedException \Respect\Validation\Exceptions\AllOfException
      */
-    public function testValidationAssertShouldFailIfAnyRuleFailsAndReturnAllExceptionsFailed($v1, $v2, $v3)
+    public function testValidationAssertShouldFailIfAnyRuleFailsAndReturnAllExceptionsFailed($v1, $v2, $v3): void
     {
         $o = new AllOf($v1, $v2, $v3);
         self::assertFalse($o->__invoke('any'));
@@ -81,7 +83,7 @@ class AllOfTest extends TestCase
      * @dataProvider providerStaticDummyRules
      * @expectedException \Respect\Validation\Exceptions\CallbackException
      */
-    public function testValidationCheckShouldFailIfAnyRuleFailsAndThrowTheFirstExceptionOnly($v1, $v2, $v3)
+    public function testValidationCheckShouldFailIfAnyRuleFailsAndThrowTheFirstExceptionOnly($v1, $v2, $v3): void
     {
         $o = new AllOf($v1, $v2, $v3);
         self::assertFalse($o->__invoke('any'));
@@ -92,7 +94,7 @@ class AllOfTest extends TestCase
      * @dataProvider providerStaticDummyRules
      * @expectedException \Respect\Validation\Exceptions\ValidationException
      */
-    public function testValidationCheckShouldFailOnEmptyInput($v1, $v2, $v3)
+    public function testValidationCheckShouldFailOnEmptyInput($v1, $v2, $v3): void
     {
         $o = new AllOf($v1, $v2, $v3);
         self::assertTrue($o->check(''));
@@ -101,7 +103,7 @@ class AllOfTest extends TestCase
     /**
      * @dataProvider providerStaticDummyRules
      */
-    public function testValidationShouldFailIfAnyRuleFails($v1, $v2, $v3)
+    public function testValidationShouldFailIfAnyRuleFails($v1, $v2, $v3): void
     {
         $o = new AllOf($v1, $v2, $v3);
         self::assertFalse($o->__invoke('any'));
diff --git a/tests/unit/Rules/AlnumTest.php b/tests/unit/Rules/AlnumTest.php
index 52459360..eb980c75 100644
--- a/tests/unit/Rules/AlnumTest.php
+++ b/tests/unit/Rules/AlnumTest.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 use PHPUnit\Framework\TestCase;
@@ -23,7 +25,7 @@ class AlnumTest extends TestCase
     /**
      * @dataProvider providerForValidAlnum
      */
-    public function testValidAlnumCharsShouldReturnTrue($validAlnum, $additional)
+    public function testValidAlnumCharsShouldReturnTrue($validAlnum, $additional): void
     {
         $validator = new Alnum($additional);
         self::assertTrue($validator->validate($validAlnum));
@@ -33,7 +35,7 @@ class AlnumTest extends TestCase
      * @dataProvider providerForInvalidAlnum
      * @expectedException \Respect\Validation\Exceptions\AlnumException
      */
-    public function testInvalidAlnumCharsShouldThrowAlnumExceptionAndReturnFalse($invalidAlnum, $additional)
+    public function testInvalidAlnumCharsShouldThrowAlnumExceptionAndReturnFalse($invalidAlnum, $additional): void
     {
         $validator = new Alnum($additional);
         self::assertFalse($validator->validate($invalidAlnum));
@@ -44,7 +46,7 @@ class AlnumTest extends TestCase
      * @dataProvider providerForInvalidParams
      * @expectedException \Respect\Validation\Exceptions\ComponentException
      */
-    public function testInvalidConstructorParamsShouldThrowComponentExceptionUponInstantiation($additional)
+    public function testInvalidConstructorParamsShouldThrowComponentExceptionUponInstantiation($additional): void
     {
         $validator = new Alnum($additional);
     }
@@ -52,7 +54,7 @@ class AlnumTest extends TestCase
     /**
      * @dataProvider providerAdditionalChars
      */
-    public function testAdditionalCharsShouldBeRespected($additional, $query)
+    public function testAdditionalCharsShouldBeRespected($additional, $query): void
     {
         $validator = new Alnum($additional);
         self::assertTrue($validator->validate($query));
diff --git a/tests/unit/Rules/AlphaTest.php b/tests/unit/Rules/AlphaTest.php
index 64c25d91..84dc6bb3 100644
--- a/tests/unit/Rules/AlphaTest.php
+++ b/tests/unit/Rules/AlphaTest.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 use PHPUnit\Framework\TestCase;
@@ -23,7 +25,7 @@ class AlphaTest extends TestCase
     /**
      * @dataProvider providerForValidAlpha
      */
-    public function testValidAlphanumericCharsShouldReturnTrue($validAlpha, $additional)
+    public function testValidAlphanumericCharsShouldReturnTrue($validAlpha, $additional): void
     {
         $validator = new Alpha($additional);
         self::assertTrue($validator->validate($validAlpha));
@@ -35,7 +37,7 @@ class AlphaTest extends TestCase
      * @dataProvider providerForInvalidAlpha
      * @expectedException \Respect\Validation\Exceptions\AlphaException
      */
-    public function testInvalidAlphanumericCharsShouldThrowAlphaException($invalidAlpha, $additional)
+    public function testInvalidAlphanumericCharsShouldThrowAlphaException($invalidAlpha, $additional): void
     {
         $validator = new Alpha($additional);
         self::assertFalse($validator->validate($invalidAlpha));
@@ -46,7 +48,7 @@ class AlphaTest extends TestCase
      * @dataProvider providerForInvalidParams
      * @expectedException \Respect\Validation\Exceptions\ComponentException
      */
-    public function testInvalidConstructorParamsShouldThrowComponentException($additional)
+    public function testInvalidConstructorParamsShouldThrowComponentException($additional): void
     {
         $validator = new Alpha($additional);
     }
@@ -54,7 +56,7 @@ class AlphaTest extends TestCase
     /**
      * @dataProvider providerAdditionalChars
      */
-    public function testAdditionalCharsShouldBeRespected($additional, $query)
+    public function testAdditionalCharsShouldBeRespected($additional, $query): void
     {
         $validator = new Alpha($additional);
         self::assertTrue($validator->validate($query));
diff --git a/tests/unit/Rules/AlwaysInvalidTest.php b/tests/unit/Rules/AlwaysInvalidTest.php
index d6b0cc00..b0e7a16c 100644
--- a/tests/unit/Rules/AlwaysInvalidTest.php
+++ b/tests/unit/Rules/AlwaysInvalidTest.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 use PHPUnit\Framework\TestCase;
@@ -37,7 +39,7 @@ class AlwaysInvalidTest extends TestCase
     /**
      * @dataProvider providerForValidAlwaysInvalid
      */
-    public function testShouldValidateInputWhenItIsAValidAlwaysInvalid($input)
+    public function testShouldValidateInputWhenItIsAValidAlwaysInvalid($input): void
     {
         $rule = new AlwaysInvalid();
 
diff --git a/tests/unit/Rules/AlwaysValidTest.php b/tests/unit/Rules/AlwaysValidTest.php
index aa7f6384..6820af1a 100644
--- a/tests/unit/Rules/AlwaysValidTest.php
+++ b/tests/unit/Rules/AlwaysValidTest.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 use PHPUnit\Framework\TestCase;
@@ -37,7 +39,7 @@ class AlwaysValidTest extends TestCase
     /**
      * @dataProvider providerForValidAlwaysValid
      */
-    public function testShouldValidateInputWhenItIsAValidAlwaysValid($input)
+    public function testShouldValidateInputWhenItIsAValidAlwaysValid($input): void
     {
         $rule = new AlwaysValid();
 
diff --git a/tests/unit/Rules/AnyOfTest.php b/tests/unit/Rules/AnyOfTest.php
index 35785871..de76543d 100644
--- a/tests/unit/Rules/AnyOfTest.php
+++ b/tests/unit/Rules/AnyOfTest.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 use PHPUnit\Framework\TestCase;
@@ -20,7 +22,7 @@ use PHPUnit\Framework\TestCase;
  */
 class AnyOfTest extends TestCase
 {
-    public function testValid()
+    public function testValid(): void
     {
         $valid1 = new Callback(function () {
             return false;
@@ -40,7 +42,7 @@ class AnyOfTest extends TestCase
     /**
      * @expectedException \Respect\Validation\Exceptions\AnyOfException
      */
-    public function testInvalid()
+    public function testInvalid(): void
     {
         $valid1 = new Callback(function () {
             return false;
@@ -59,7 +61,7 @@ class AnyOfTest extends TestCase
     /**
      * @expectedException \Respect\Validation\Exceptions\XdigitException
      */
-    public function testInvalidCheck()
+    public function testInvalidCheck(): void
     {
         $o = new AnyOf(new Xdigit(), new Alnum());
         self::assertFalse($o->validate(-10));
diff --git a/tests/unit/Rules/ArrayTypeTest.php b/tests/unit/Rules/ArrayTypeTest.php
index 613ff67e..774c3f13 100644
--- a/tests/unit/Rules/ArrayTypeTest.php
+++ b/tests/unit/Rules/ArrayTypeTest.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 /**
diff --git a/tests/unit/Rules/ArrayValTest.php b/tests/unit/Rules/ArrayValTest.php
index 1cf097dd..78ddf488 100644
--- a/tests/unit/Rules/ArrayValTest.php
+++ b/tests/unit/Rules/ArrayValTest.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 use ArrayObject;
diff --git a/tests/unit/Rules/AttributeTest.php b/tests/unit/Rules/AttributeTest.php
index 10c1a54c..c05b930f 100644
--- a/tests/unit/Rules/AttributeTest.php
+++ b/tests/unit/Rules/AttributeTest.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 use PHPUnit\Framework\TestCase;
@@ -25,7 +27,7 @@ class PrivClass
  */
 class AttributeTest extends TestCase
 {
-    public function testAttributeWithNoExtraValidationShouldCheckItsPresence()
+    public function testAttributeWithNoExtraValidationShouldCheckItsPresence(): void
     {
         $validator = new Attribute('bar');
         $obj = new \stdClass();
@@ -38,7 +40,7 @@ class AttributeTest extends TestCase
     /**
      * @expectedException \Respect\Validation\Exceptions\AttributeException
      */
-    public function testAbsentAttributeShouldRaiseAttributeException()
+    public function testAbsentAttributeShouldRaiseAttributeException(): void
     {
         $validator = new Attribute('bar');
         $obj = new \stdClass();
@@ -46,10 +48,11 @@ class AttributeTest extends TestCase
         self::assertFalse($validator->__invoke($obj));
         self::assertFalse($validator->assert($obj));
     }
+
     /**
      * @expectedException \Respect\Validation\Exceptions\ValidationException
      */
-    public function testAbsentAttributeShouldRaiseAttributeException_on_check()
+    public function testAbsentAttributeShouldRaiseAttributeException_on_check(): void
     {
         $validator = new Attribute('bar');
         $obj = new \stdClass();
@@ -62,7 +65,7 @@ class AttributeTest extends TestCase
      * @dataProvider providerForInvalidAttributeNames
      * @expectedException \Respect\Validation\Exceptions\ComponentException
      */
-    public function testInvalidConstructorArgumentsShouldThrowComponentException($attributeName)
+    public function testInvalidConstructorArgumentsShouldThrowComponentException($attributeName): void
     {
         $validator = new Attribute($attributeName);
     }
@@ -76,7 +79,7 @@ class AttributeTest extends TestCase
         ];
     }
 
-    public function testExtraValidatorRulesForAttribute()
+    public function testExtraValidatorRulesForAttribute(): void
     {
         $subValidator = new Length(1, 3);
         $validator = new Attribute('bar', $subValidator);
@@ -90,7 +93,7 @@ class AttributeTest extends TestCase
     /**
      * @expectedException \Respect\Validation\Exceptions\AttributeException
      */
-    public function testShouldNotValidateEmptyString()
+    public function testShouldNotValidateEmptyString(): void
     {
         $subValidator = new Length(1, 3);
         $validator = new Attribute('bar', $subValidator);
@@ -101,7 +104,7 @@ class AttributeTest extends TestCase
         $validator->assert('');
     }
 
-    public function testExtraValidatorRulesForAttribute_should_fail_if_invalid()
+    public function testExtraValidatorRulesForAttribute_should_fail_if_invalid(): void
     {
         $subValidator = new Length(1, 3);
         $validator = new Attribute('bar', $subValidator);
@@ -113,7 +116,7 @@ class AttributeTest extends TestCase
     /**
      * @expectedException \Respect\Validation\Exceptions\LengthException
      */
-    public function testExtraValidatorRulesForAttribute_should_raise_extra_validator_exception_on_check()
+    public function testExtraValidatorRulesForAttribute_should_raise_extra_validator_exception_on_check(): void
     {
         $subValidator = new Length(1, 3);
         $validator = new Attribute('bar', $subValidator);
@@ -121,10 +124,11 @@ class AttributeTest extends TestCase
         $obj->bar = 'foo hey this has more than 3 chars';
         self::assertFalse($validator->check($obj));
     }
+
     /**
      * @expectedException \Respect\Validation\Exceptions\AttributeException
      */
-    public function testExtraValidatorRulesForAttribute_should_raise_AttributeException_on_assert()
+    public function testExtraValidatorRulesForAttribute_should_raise_AttributeException_on_assert(): void
     {
         $subValidator = new Length(1, 3);
         $validator = new Attribute('bar', $subValidator);
@@ -133,14 +137,14 @@ class AttributeTest extends TestCase
         self::assertFalse($validator->assert($obj));
     }
 
-    public function testNotMandatoryAttributeShouldNotFailWhenAttributeIsAbsent()
+    public function testNotMandatoryAttributeShouldNotFailWhenAttributeIsAbsent(): void
     {
         $validator = new Attribute('bar', null, false);
         $obj = new \stdClass();
         self::assertTrue($validator->__invoke($obj));
     }
 
-    public function testNotMandatoryAttributeShouldNotFailWhenAttributeIsAbsent_with_extra_validator()
+    public function testNotMandatoryAttributeShouldNotFailWhenAttributeIsAbsent_with_extra_validator(): void
     {
         $subValidator = new Length(1, 3);
         $validator = new Attribute('bar', $subValidator, false);
@@ -148,7 +152,7 @@ class AttributeTest extends TestCase
         self::assertTrue($validator->__invoke($obj));
     }
 
-    public function testPrivateAttributeShouldAlsoBeChecked()
+    public function testPrivateAttributeShouldAlsoBeChecked(): void
     {
         $subValidator = new Length(1, 3);
         $validator = new Attribute('bar', $subValidator);
@@ -156,7 +160,7 @@ class AttributeTest extends TestCase
         self::assertTrue($validator->assert($obj));
     }
 
-    public function testPrivateAttributeShouldFailIfNotValid()
+    public function testPrivateAttributeShouldFailIfNotValid(): void
     {
         $subValidator = new Length(33333, 888888);
         $validator = new Attribute('bar', $subValidator);
diff --git a/tests/unit/Rules/Base64Test.php b/tests/unit/Rules/Base64Test.php
index 2c7764ea..3cb7f263 100644
--- a/tests/unit/Rules/Base64Test.php
+++ b/tests/unit/Rules/Base64Test.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 /**
diff --git a/tests/unit/Rules/BaseTest.php b/tests/unit/Rules/BaseTest.php
index d0f40bc9..a59ae9d6 100644
--- a/tests/unit/Rules/BaseTest.php
+++ b/tests/unit/Rules/BaseTest.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 use PHPUnit\Framework\TestCase;
@@ -25,7 +27,7 @@ class BaseTest extends TestCase
     /**
      * @dataProvider providerForBase
      */
-    public function testBase($base, $input)
+    public function testBase($base, $input): void
     {
         $object = new Base($base);
         self::assertTrue($object->__invoke($input));
@@ -36,7 +38,7 @@ class BaseTest extends TestCase
     /**
      * @dataProvider providerForInvalidBase
      */
-    public function testInvalidBase($base, $input)
+    public function testInvalidBase($base, $input): void
     {
         $object = new Base($base);
         self::assertFalse($object->__invoke($input));
@@ -46,7 +48,7 @@ class BaseTest extends TestCase
      * @dataProvider providerForExceptionBase
      * @expectedException \Respect\Validation\Exceptions\BaseException
      */
-    public function testExceptionBase($base, $input)
+    public function testExceptionBase($base, $input): void
     {
         $object = new Base($base);
         self::assertTrue($object->__invoke($input));
@@ -56,7 +58,7 @@ class BaseTest extends TestCase
     /**
      * @dataProvider providerForCustomBase
      */
-    public function testCustomBase($base, $custom, $input)
+    public function testCustomBase($base, $custom, $input): void
     {
         $object = new Base($base, $custom);
         self::assertTrue($object->__invoke($input));
diff --git a/tests/unit/Rules/BetweenTest.php b/tests/unit/Rules/BetweenTest.php
index c5d06154..b8b721ce 100644
--- a/tests/unit/Rules/BetweenTest.php
+++ b/tests/unit/Rules/BetweenTest.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 use DateTime;
@@ -65,7 +67,7 @@ class BetweenTest extends TestCase
     /**
      * @dataProvider providerValid
      */
-    public function testValuesBetweenBoundsShouldPass($min, $max, $inclusive, $input)
+    public function testValuesBetweenBoundsShouldPass($min, $max, $inclusive, $input): void
     {
         $o = new Between($min, $max, $inclusive);
         self::assertTrue($o->__invoke($input));
@@ -77,7 +79,7 @@ class BetweenTest extends TestCase
      * @dataProvider providerInvalid
      * @expectedException \Respect\Validation\Exceptions\BetweenException
      */
-    public function testValuesOutBoundsShouldRaiseException($min, $max, $inclusive, $input)
+    public function testValuesOutBoundsShouldRaiseException($min, $max, $inclusive, $input): void
     {
         $o = new Between($min, $max, $inclusive);
         self::assertFalse($o->__invoke($input));
@@ -87,7 +89,7 @@ class BetweenTest extends TestCase
     /**
      * @expectedException \Respect\Validation\Exceptions\ComponentException
      */
-    public function testInvalidConstructionParamsShouldRaiseException()
+    public function testInvalidConstructionParamsShouldRaiseException(): void
     {
         $o = new Between(10, 5);
     }
diff --git a/tests/unit/Rules/BoolTypeTest.php b/tests/unit/Rules/BoolTypeTest.php
index 62d2be0c..7329681c 100644
--- a/tests/unit/Rules/BoolTypeTest.php
+++ b/tests/unit/Rules/BoolTypeTest.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 use PHPUnit\Framework\TestCase;
@@ -20,7 +22,7 @@ use PHPUnit\Framework\TestCase;
  */
 class BoolTypeTest extends TestCase
 {
-    public function testBooleanValuesONLYShouldReturnTrue()
+    public function testBooleanValuesONLYShouldReturnTrue(): void
     {
         $validator = new BoolType();
         self::assertTrue($validator->__invoke(true));
@@ -34,13 +36,13 @@ class BoolTypeTest extends TestCase
     /**
      * @expectedException \Respect\Validation\Exceptions\BoolTypeException
      */
-    public function testInvalidBooleanShouldRaiseException()
+    public function testInvalidBooleanShouldRaiseException(): void
     {
         $validator = new BoolType();
         self::assertFalse($validator->check('foo'));
     }
 
-    public function testInvalidBooleanValuesShouldReturnFalse()
+    public function testInvalidBooleanValuesShouldReturnFalse(): void
     {
         $validator = new BoolType();
         self::assertFalse($validator->__invoke(''));
diff --git a/tests/unit/Rules/BoolValTest.php b/tests/unit/Rules/BoolValTest.php
index c0bde755..5cc01601 100644
--- a/tests/unit/Rules/BoolValTest.php
+++ b/tests/unit/Rules/BoolValTest.php
@@ -1,4 +1,5 @@
 <?php
+
 /*
  * This file is part of Respect/Validation.
  *
@@ -8,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 /**
diff --git a/tests/unit/Rules/BsnTest.php b/tests/unit/Rules/BsnTest.php
index 13e2424a..eabcdcc9 100644
--- a/tests/unit/Rules/BsnTest.php
+++ b/tests/unit/Rules/BsnTest.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 use PHPUnit\Framework\TestCase;
@@ -28,7 +30,7 @@ class BsnTest extends TestCase
     /**
      * {@inheritdoc}
      */
-    protected function setUp()
+    protected function setUp(): void
     {
         $this->rule = new Bsn();
     }
@@ -38,7 +40,7 @@ class BsnTest extends TestCase
      *
      * @param string $input
      */
-    public function testShouldValidateBsn($input)
+    public function testShouldValidateBsn($input): void
     {
         self::assertTrue($this->rule->validate($input));
     }
@@ -48,7 +50,7 @@ class BsnTest extends TestCase
      *
      * @param string $input
      */
-    public function testShouldNotValidateBsn($input)
+    public function testShouldNotValidateBsn($input): void
     {
         self::assertFalse($this->rule->validate($input));
     }
diff --git a/tests/unit/Rules/CallTest.php b/tests/unit/Rules/CallTest.php
index 5b06a29c..27dde98d 100644
--- a/tests/unit/Rules/CallTest.php
+++ b/tests/unit/Rules/CallTest.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 use PHPUnit\Framework\TestCase;
@@ -25,25 +27,25 @@ class CallTest extends TestCase
         return [];
     }
 
-    public function testCallbackValidatorShouldAcceptEmptyString()
+    public function testCallbackValidatorShouldAcceptEmptyString(): void
     {
         $v = new Call('str_split', new ArrayVal());
         self::assertTrue($v->assert(''));
     }
 
-    public function testCallbackValidatorShouldAcceptStringWithFunctionName()
+    public function testCallbackValidatorShouldAcceptStringWithFunctionName(): void
     {
         $v = new Call('str_split', new ArrayVal());
         self::assertTrue($v->assert('test'));
     }
 
-    public function testCallbackValidatorShouldAcceptArrayCallbackDefinition()
+    public function testCallbackValidatorShouldAcceptArrayCallbackDefinition(): void
     {
         $v = new Call([$this, 'thisIsASampleCallbackUsedInsideThisTest'], new ArrayVal());
         self::assertTrue($v->assert('test'));
     }
 
-    public function testCallbackValidatorShouldAcceptClosures()
+    public function testCallbackValidatorShouldAcceptClosures(): void
     {
         $v = new Call(function () {
             return [];
@@ -54,7 +56,7 @@ class CallTest extends TestCase
     /**
      * @expectedException \Respect\Validation\Exceptions\CallException
      */
-    public function testCallbackFailedShouldThrowCallException()
+    public function testCallbackFailedShouldThrowCallException(): void
     {
         $v = new Call('strrev', new ArrayVal());
         self::assertFalse($v->validate('test'));
diff --git a/tests/unit/Rules/CallableTypeTest.php b/tests/unit/Rules/CallableTypeTest.php
index e0b28aa7..23e1203c 100644
--- a/tests/unit/Rules/CallableTypeTest.php
+++ b/tests/unit/Rules/CallableTypeTest.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 use PHPUnit\Framework\TestCase;
@@ -22,7 +24,7 @@ class CallableTypeTest extends TestCase
 {
     protected $rule;
 
-    protected function setUp()
+    protected function setUp(): void
     {
         $this->rule = new CallableType();
     }
@@ -30,7 +32,7 @@ class CallableTypeTest extends TestCase
     /**
      * @dataProvider providerForCallable
      */
-    public function testShouldValidateCallableTypeNumbers($input)
+    public function testShouldValidateCallableTypeNumbers($input): void
     {
         self::assertTrue($this->rule->validate($input));
     }
@@ -38,7 +40,7 @@ class CallableTypeTest extends TestCase
     /**
      * @dataProvider providerForNonCallable
      */
-    public function testShouldNotValidateNonCallableTypeNumbers($input)
+    public function testShouldNotValidateNonCallableTypeNumbers($input): void
     {
         self::assertFalse($this->rule->validate($input));
     }
@@ -47,7 +49,7 @@ class CallableTypeTest extends TestCase
      * @expectedException \Respect\Validation\Exceptions\CallableTypeException
      * @expectedExceptionMessage "testShouldThrowCallableTypeExceptionWhenChecking" must be a callable
      */
-    public function testShouldThrowCallableTypeExceptionWhenChecking()
+    public function testShouldThrowCallableTypeExceptionWhenChecking(): void
     {
         $this->rule->check(__FUNCTION__);
     }
@@ -55,7 +57,7 @@ class CallableTypeTest extends TestCase
     public function providerForCallable()
     {
         return [
-            [function () {
+            [function (): void {
             }],
             ['trim'],
             [__METHOD__],
diff --git a/tests/unit/Rules/CallbackTest.php b/tests/unit/Rules/CallbackTest.php
index de276816..2d8e8ece 100644
--- a/tests/unit/Rules/CallbackTest.php
+++ b/tests/unit/Rules/CallbackTest.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 use PHPUnit\Framework\TestCase;
@@ -20,9 +22,10 @@ use PHPUnit\Framework\TestCase;
  */
 class CallbackTest extends TestCase
 {
-    private $truthy, $falsy;
+    private $truthy;
+    private $falsy;
 
-    public function setUp()
+    public function setUp(): void
     {
         $this->truthy = new Callback(function () {
             return true;
@@ -37,7 +40,7 @@ class CallbackTest extends TestCase
         return true;
     }
 
-    public function testShouldBeAbleToDefineLatestArgumentsOnConstructor()
+    public function testShouldBeAbleToDefineLatestArgumentsOnConstructor(): void
     {
         $rule = new Callback('is_a', 'stdClass');
 
@@ -47,12 +50,12 @@ class CallbackTest extends TestCase
     /**
      * @expectedException \Respect\Validation\Exceptions\CallbackException
      */
-    public function testCallbackValidatorShouldReturnFalseForEmptyString()
+    public function testCallbackValidatorShouldReturnFalseForEmptyString(): void
     {
         $this->falsy->assert('');
     }
 
-    public function testCallbackValidatorShouldReturnTrueIfCallbackReturnsTrue()
+    public function testCallbackValidatorShouldReturnTrueIfCallbackReturnsTrue(): void
     {
         self::assertTrue($this->truthy->assert('wpoiur'));
     }
@@ -60,18 +63,18 @@ class CallbackTest extends TestCase
     /**
      * @expectedException \Respect\Validation\Exceptions\CallbackException
      */
-    public function testCallbackValidatorShouldReturnFalseIfCallbackReturnsFalse()
+    public function testCallbackValidatorShouldReturnFalseIfCallbackReturnsFalse(): void
     {
         self::assertTrue($this->falsy->assert('w poiur'));
     }
 
-    public function testCallbackValidatorShouldAcceptArrayCallbackDefinitions()
+    public function testCallbackValidatorShouldAcceptArrayCallbackDefinitions(): void
     {
         $v = new Callback([$this, 'thisIsASampleCallbackUsedInsideThisTest']);
         self::assertTrue($v->assert('test'));
     }
 
-    public function testCallbackValidatorShouldAcceptFunctionNamesAsString()
+    public function testCallbackValidatorShouldAcceptFunctionNamesAsString(): void
     {
         $v = new Callback('is_string');
         self::assertTrue($v->assert('test'));
@@ -80,7 +83,7 @@ class CallbackTest extends TestCase
     /**
      * @expectedException \Respect\Validation\Exceptions\ComponentException
      */
-    public function testInvalidCallbacksShouldRaiseComponentExceptionUponInstantiation()
+    public function testInvalidCallbacksShouldRaiseComponentExceptionUponInstantiation(): void
     {
         $v = new Callback(new \stdClass());
         self::assertTrue($v->assert('w poiur'));
diff --git a/tests/unit/Rules/CharsetTest.php b/tests/unit/Rules/CharsetTest.php
index ecf53eae..245419c8 100644
--- a/tests/unit/Rules/CharsetTest.php
+++ b/tests/unit/Rules/CharsetTest.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 use PHPUnit\Framework\TestCase;
@@ -23,7 +25,7 @@ class CharsetTest extends TestCase
     /**
      * @dataProvider providerForValidCharset
      */
-    public function testValidDataWithCharsetShouldReturnTrue($charset, $input)
+    public function testValidDataWithCharsetShouldReturnTrue($charset, $input): void
     {
         $validator = new Charset($charset);
         self::assertTrue($validator->__invoke($input));
@@ -33,7 +35,7 @@ class CharsetTest extends TestCase
      * @dataProvider providerForInvalidCharset
      * @expectedException \Respect\Validation\Exceptions\CharsetException
      */
-    public function testInvalidCharsetShouldFailAndThrowCharsetException($charset, $input)
+    public function testInvalidCharsetShouldFailAndThrowCharsetException($charset, $input): void
     {
         $validator = new Charset($charset);
         self::assertFalse($validator->__invoke($input));
@@ -44,7 +46,7 @@ class CharsetTest extends TestCase
      * @dataProvider providerForInvalidParams
      * @expectedException \Respect\Validation\Exceptions\ComponentException
      */
-    public function testInvalidConstructorParamsShouldThrowComponentExceptionUponInstantiation($charset)
+    public function testInvalidConstructorParamsShouldThrowComponentExceptionUponInstantiation($charset): void
     {
         $validator = new Charset($charset);
     }
diff --git a/tests/unit/Rules/CnhTest.php b/tests/unit/Rules/CnhTest.php
index f1d945ca..587ae623 100644
--- a/tests/unit/Rules/CnhTest.php
+++ b/tests/unit/Rules/CnhTest.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 use PHPUnit\Framework\TestCase;
@@ -22,7 +24,7 @@ class CnhTest extends TestCase
 {
     protected $cnhValidator;
 
-    protected function setUp()
+    protected function setUp(): void
     {
         $this->cnhValidator = new Cnh();
     }
@@ -30,7 +32,7 @@ class CnhTest extends TestCase
     /**
      * @dataProvider validCnhProvider
      */
-    public function testValidCnh($cnh)
+    public function testValidCnh($cnh): void
     {
         self::assertTrue($this->cnhValidator->assert($cnh));
         self::assertTrue($this->cnhValidator->__invoke($cnh));
@@ -41,7 +43,7 @@ class CnhTest extends TestCase
      * @dataProvider invalidCnhProvider
      * @expectedException \Respect\Validation\Exceptions\CnhException
      */
-    public function testInvalidCnh($cnh)
+    public function testInvalidCnh($cnh): void
     {
         $expectedInvalid = $this->cnhValidator->assert($cnh);
         self::assertFalse($expectedInvalid);
@@ -51,7 +53,7 @@ class CnhTest extends TestCase
      * @dataProvider notIntegerCnhProvider
      * @expectedException \Respect\Validation\Exceptions\CnhException
      */
-    public function testNotIntegerCnh($cnh)
+    public function testNotIntegerCnh($cnh): void
     {
         $expectedInvalid = $this->cnhValidator->assert($cnh);
         self::assertFalse($expectedInvalid);
@@ -61,7 +63,7 @@ class CnhTest extends TestCase
      * @dataProvider invalidCnhLengthProvider
      * @expectedException \Respect\Validation\Exceptions\CnhException
      */
-    public function testInvalidLengthCnh($cnh)
+    public function testInvalidLengthCnh($cnh): void
     {
         $expectedInvalid = $this->cnhValidator->assert($cnh);
         self::assertFalse($expectedInvalid);
diff --git a/tests/unit/Rules/CnpjTest.php b/tests/unit/Rules/CnpjTest.php
index 1fa497de..ebe7ad97 100644
--- a/tests/unit/Rules/CnpjTest.php
+++ b/tests/unit/Rules/CnpjTest.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 use PHPUnit\Framework\TestCase;
@@ -22,7 +24,7 @@ class CnpjTest extends TestCase
 {
     protected $cnpjValidator;
 
-    protected function setUp()
+    protected function setUp(): void
     {
         $this->cnpjValidator = new Cnpj();
     }
@@ -30,7 +32,7 @@ class CnpjTest extends TestCase
     /**
      * @dataProvider providerValidFormattedCnpj
      */
-    public function testFormattedCnpjsShouldValidate($input)
+    public function testFormattedCnpjsShouldValidate($input): void
     {
         self::assertTrue($this->cnpjValidator->validate($input));
     }
@@ -38,7 +40,7 @@ class CnpjTest extends TestCase
     /**
      * @dataProvider providerValidUnformattedCnpj
      */
-    public function testUnformattedCnpjsShouldValidate($input)
+    public function testUnformattedCnpjsShouldValidate($input): void
     {
         self::assertTrue($this->cnpjValidator->validate($input));
     }
@@ -46,7 +48,7 @@ class CnpjTest extends TestCase
     /**
      * @dataProvider providerInvalidFormattedCnpj
      */
-    public function testFormattedCnpjsShouldNotValidate($input)
+    public function testFormattedCnpjsShouldNotValidate($input): void
     {
         self::assertFalse($this->cnpjValidator->validate($input));
     }
@@ -54,7 +56,7 @@ class CnpjTest extends TestCase
     /**
      * @dataProvider providerInvalidUnformattedCnpj
      */
-    public function testUnformattedCnpjsShouldNotValidate($input)
+    public function testUnformattedCnpjsShouldNotValidate($input): void
     {
         self::assertFalse($this->cnpjValidator->validate($input));
     }
@@ -62,7 +64,7 @@ class CnpjTest extends TestCase
     /**
      * @dataProvider providerInvalidFormattedAndUnformattedCnpjLength
      */
-    public function testFormattedAndUnformattedCnpjsShouldNotValidate($input)
+    public function testFormattedAndUnformattedCnpjsShouldNotValidate($input): void
     {
         self::assertFalse($this->cnpjValidator->validate($input));
     }
diff --git a/tests/unit/Rules/CntrlTest.php b/tests/unit/Rules/CntrlTest.php
index 7ed1ad9d..30b36fb0 100644
--- a/tests/unit/Rules/CntrlTest.php
+++ b/tests/unit/Rules/CntrlTest.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 use PHPUnit\Framework\TestCase;
@@ -23,7 +25,7 @@ class CntrlTest extends TestCase
     /**
      * @dataProvider providerForValidCntrl
      */
-    public function testValidDataWithCntrlShouldReturnTrue($validCntrl, $additional = '')
+    public function testValidDataWithCntrlShouldReturnTrue($validCntrl, $additional = ''): void
     {
         $validator = new Cntrl($additional);
         self::assertTrue($validator->validate($validCntrl));
@@ -33,7 +35,7 @@ class CntrlTest extends TestCase
      * @dataProvider providerForInvalidCntrl
      * @expectedException \Respect\Validation\Exceptions\CntrlException
      */
-    public function testInvalidCntrlShouldFailAndThrowCntrlException($invalidCntrl, $additional = '')
+    public function testInvalidCntrlShouldFailAndThrowCntrlException($invalidCntrl, $additional = ''): void
     {
         $validator = new Cntrl($additional);
         self::assertFalse($validator->validate($invalidCntrl));
@@ -44,7 +46,7 @@ class CntrlTest extends TestCase
      * @dataProvider providerForInvalidParams
      * @expectedException \Respect\Validation\Exceptions\ComponentException
      */
-    public function testInvalidConstructorParamsShouldThrowComponentExceptionUponInstantiation($additional)
+    public function testInvalidConstructorParamsShouldThrowComponentExceptionUponInstantiation($additional): void
     {
         $validator = new Cntrl($additional);
     }
@@ -52,7 +54,7 @@ class CntrlTest extends TestCase
     /**
      * @dataProvider providerAdditionalChars
      */
-    public function testAdditionalCharsShouldBeRespected($additional, $query)
+    public function testAdditionalCharsShouldBeRespected($additional, $query): void
     {
         $validator = new Cntrl($additional);
         self::assertTrue($validator->validate($query));
diff --git a/tests/unit/Rules/ConsonantTest.php b/tests/unit/Rules/ConsonantTest.php
index 19c8640e..dbfef861 100644
--- a/tests/unit/Rules/ConsonantTest.php
+++ b/tests/unit/Rules/ConsonantTest.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 use PHPUnit\Framework\TestCase;
@@ -23,7 +25,7 @@ class ConsonantTest extends TestCase
     /**
      * @dataProvider providerForValidConsonants
      */
-    public function testValidDataWithConsonantsShouldReturnTrue($validConsonants, $additional = '')
+    public function testValidDataWithConsonantsShouldReturnTrue($validConsonants, $additional = ''): void
     {
         $validator = new Consonant($additional);
         self::assertTrue($validator->validate($validConsonants));
@@ -33,7 +35,7 @@ class ConsonantTest extends TestCase
      * @dataProvider providerForInvalidConsonants
      * @expectedException \Respect\Validation\Exceptions\ConsonantException
      */
-    public function testInvalidConsonantsShouldFailAndThrowConsonantException($invalidConsonants, $additional = '')
+    public function testInvalidConsonantsShouldFailAndThrowConsonantException($invalidConsonants, $additional = ''): void
     {
         $validator = new Consonant($additional);
         self::assertFalse($validator->validate($invalidConsonants));
@@ -44,7 +46,7 @@ class ConsonantTest extends TestCase
      * @dataProvider providerForInvalidParams
      * @expectedException \Respect\Validation\Exceptions\ComponentException
      */
-    public function testInvalidConstructorParamsShouldThrowComponentExceptionUponInstantiation($additional)
+    public function testInvalidConstructorParamsShouldThrowComponentExceptionUponInstantiation($additional): void
     {
         $validator = new Consonant($additional);
     }
@@ -52,7 +54,7 @@ class ConsonantTest extends TestCase
     /**
      * @dataProvider providerAdditionalChars
      */
-    public function testAdditionalCharsShouldBeRespected($additional, $query)
+    public function testAdditionalCharsShouldBeRespected($additional, $query): void
     {
         $validator = new Consonant($additional);
         self::assertTrue($validator->validate($query));
diff --git a/tests/unit/Rules/ContainsTest.php b/tests/unit/Rules/ContainsTest.php
index 528e7d5a..86ce112a 100644
--- a/tests/unit/Rules/ContainsTest.php
+++ b/tests/unit/Rules/ContainsTest.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 use PHPUnit\Framework\TestCase;
@@ -23,7 +25,7 @@ class ContainsTest extends TestCase
     /**
      * @dataProvider providerForContainsIdentical
      */
-    public function testStringsContainingExpectedIdenticalValueShouldPass($start, $input)
+    public function testStringsContainingExpectedIdenticalValueShouldPass($start, $input): void
     {
         $v = new Contains($start, true);
         self::assertTrue($v->validate($input));
@@ -32,7 +34,7 @@ class ContainsTest extends TestCase
     /**
      * @dataProvider providerForContains
      */
-    public function testStringsContainingExpectedValueShouldPass($start, $input)
+    public function testStringsContainingExpectedValueShouldPass($start, $input): void
     {
         $v = new Contains($start, false);
         self::assertTrue($v->validate($input));
@@ -41,7 +43,7 @@ class ContainsTest extends TestCase
     /**
      * @dataProvider providerForNotContainsIdentical
      */
-    public function testStringsNotContainsExpectedIdenticalValueShouldNotPass($start, $input)
+    public function testStringsNotContainsExpectedIdenticalValueShouldNotPass($start, $input): void
     {
         $v = new Contains($start, true);
         self::assertFalse($v->validate($input));
@@ -50,7 +52,7 @@ class ContainsTest extends TestCase
     /**
      * @dataProvider providerForNotContains
      */
-    public function testStringsNotContainsExpectedValueShouldNotPass($start, $input)
+    public function testStringsNotContainsExpectedValueShouldNotPass($start, $input): void
     {
         $v = new Contains($start, false);
         self::assertFalse($v->validate($input));
diff --git a/tests/unit/Rules/CountableTest.php b/tests/unit/Rules/CountableTest.php
index c61c9df2..ad746fcc 100644
--- a/tests/unit/Rules/CountableTest.php
+++ b/tests/unit/Rules/CountableTest.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 /**
diff --git a/tests/unit/Rules/CountryCodeTest.php b/tests/unit/Rules/CountryCodeTest.php
index c3ae5758..f54705a4 100644
--- a/tests/unit/Rules/CountryCodeTest.php
+++ b/tests/unit/Rules/CountryCodeTest.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 use PHPUnit\Framework\TestCase;
@@ -23,17 +25,18 @@ class CountryCodeTest extends TestCase
      * @expectedException        \Respect\Validation\Exceptions\ComponentException
      * @expectedExceptionMessage "whatever" is not a valid country set
      */
-    public function testShouldThrowsExceptionWhenInvalidFormat()
+    public function testShouldThrowsExceptionWhenInvalidFormat(): void
     {
         new CountryCode('whatever');
     }
 
-    public function testShouldUseISO3166Alpha2ByDefault()
+    public function testShouldUseISO3166Alpha2ByDefault(): void
     {
         $country = new CountryCode();
         self::assertEquals(CountryCode::ALPHA2, $country->set);
     }
-    public function testShouldDefineACountryFormatOnConstructor()
+
+    public function testShouldDefineACountryFormatOnConstructor(): void
     {
         $country = new CountryCode(CountryCode::NUMERIC);
         self::assertEquals(CountryCode::NUMERIC, $country->set);
@@ -66,7 +69,7 @@ class CountryCodeTest extends TestCase
     /**
      * @dataProvider providerForValidCountryCode
      */
-    public function testValidContryCodes($format, $input)
+    public function testValidContryCodes($format, $input): void
     {
         $rule = new CountryCode($format);
 
@@ -76,7 +79,7 @@ class CountryCodeTest extends TestCase
     /**
      * @dataProvider providerForInvalidCountryCode
      */
-    public function testInvalidContryCodes($format, $input)
+    public function testInvalidContryCodes($format, $input): void
     {
         $rule = new CountryCode($format);
 
diff --git a/tests/unit/Rules/CpfTest.php b/tests/unit/Rules/CpfTest.php
index c2ec918b..015d5ac2 100644
--- a/tests/unit/Rules/CpfTest.php
+++ b/tests/unit/Rules/CpfTest.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 use PHPUnit\Framework\TestCase;
@@ -22,7 +24,7 @@ class CpfTest extends TestCase
 {
     protected $cpfValidator;
 
-    protected function setUp()
+    protected function setUp(): void
     {
         $this->cpfValidator = new Cpf();
     }
@@ -30,7 +32,7 @@ class CpfTest extends TestCase
     /**
      * @dataProvider providerValidFormattedCpf
      */
-    public function testFormattedCpfsShouldValidate($input)
+    public function testFormattedCpfsShouldValidate($input): void
     {
         self::assertTrue($this->cpfValidator->assert($input));
     }
@@ -38,7 +40,7 @@ class CpfTest extends TestCase
     /**
      * @dataProvider providerValidUnformattedCpf
      */
-    public function testUnformattedCpfsShouldValidates($input)
+    public function testUnformattedCpfsShouldValidates($input): void
     {
         self::assertTrue($this->cpfValidator->assert($input));
     }
@@ -47,7 +49,7 @@ class CpfTest extends TestCase
      * @dataProvider providerInvalidFormattedCpf
      * @expectedException \Respect\Validation\Exceptions\CpfException
      */
-    public function testInvalidCpfShouldFailWhenFormatted($input)
+    public function testInvalidCpfShouldFailWhenFormatted($input): void
     {
         self::assertFalse($this->cpfValidator->assert($input));
     }
@@ -56,7 +58,7 @@ class CpfTest extends TestCase
      * @dataProvider providerInvalidUnformattedCpf
      * @expectedException \Respect\Validation\Exceptions\CpfException
      */
-    public function testInvalidCpfShouldFailWhenNotFormatted($input)
+    public function testInvalidCpfShouldFailWhenNotFormatted($input): void
     {
         self::assertFalse($this->cpfValidator->assert($input));
     }
@@ -65,7 +67,7 @@ class CpfTest extends TestCase
      * @dataProvider providerInvalidFormattedAndUnformattedCpfLength
      * @expectedException \Respect\Validation\Exceptions\CpfException
      */
-    public function testCpfsWithIncorrectLengthShouldFail($input)
+    public function testCpfsWithIncorrectLengthShouldFail($input): void
     {
         self::assertFalse($this->cpfValidator->assert($input));
     }
diff --git a/tests/unit/Rules/CreditCardTest.php b/tests/unit/Rules/CreditCardTest.php
index f4f3dc6f..926041ef 100644
--- a/tests/unit/Rules/CreditCardTest.php
+++ b/tests/unit/Rules/CreditCardTest.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 use Respect\Validation\Exceptions\ComponentException;
@@ -19,21 +21,21 @@ use Respect\Validation\Exceptions\ComponentException;
  */
 class CreditCardTest extends RuleTestCase
 {
-    public function testShouldHaveNoCreditCardBrandByDefault()
+    public function testShouldHaveNoCreditCardBrandByDefault(): void
     {
         $rule = new CreditCard();
 
         self::assertNull($rule->brand);
     }
 
-    public function testShouldAcceptCreditCardBrandOnConstructor()
+    public function testShouldAcceptCreditCardBrandOnConstructor(): void
     {
         $rule = new CreditCard(CreditCard::VISA);
 
         self::assertSame(CreditCard::VISA, $rule->brand);
     }
 
-    public function testShouldThrowExceptionWhenCreditCardBrandIsNotValid()
+    public function testShouldThrowExceptionWhenCreditCardBrandIsNotValid(): void
     {
         $message = '"RespectCard" is not a valid credit card brand';
         $message .= ' (Available: American Express, Diners Club, Discover, JCB, MasterCard, Visa).';
diff --git a/tests/unit/Rules/CurrencyCodeTest.php b/tests/unit/Rules/CurrencyCodeTest.php
index 5d22b951..debbb89a 100644
--- a/tests/unit/Rules/CurrencyCodeTest.php
+++ b/tests/unit/Rules/CurrencyCodeTest.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 /**
diff --git a/tests/unit/Rules/DateTimeTest.php b/tests/unit/Rules/DateTimeTest.php
index 169f0444..00d510e2 100644
--- a/tests/unit/Rules/DateTimeTest.php
+++ b/tests/unit/Rules/DateTimeTest.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 use DateTimeImmutable;
@@ -23,12 +25,12 @@ class DateTimeTest extends TestCase
 {
     protected $dateValidator;
 
-    protected function setUp()
+    protected function setUp(): void
     {
         $this->dateValidator = new DateTime();
     }
 
-    public function testDateEmptyShouldNotValidate()
+    public function testDateEmptyShouldNotValidate(): void
     {
         self::assertFalse($this->dateValidator->__invoke(''));
     }
@@ -36,7 +38,7 @@ class DateTimeTest extends TestCase
     /**
      * @expectedException \Respect\Validation\Exceptions\DateTimeException
      */
-    public function testDateEmptyShouldNotCheck()
+    public function testDateEmptyShouldNotCheck(): void
     {
         $this->dateValidator->check('');
     }
@@ -44,17 +46,17 @@ class DateTimeTest extends TestCase
     /**
      * @expectedException \Respect\Validation\Exceptions\DateTimeException
      */
-    public function testDateEmptyShouldNotAssert()
+    public function testDateEmptyShouldNotAssert(): void
     {
         $this->dateValidator->assert('');
     }
 
-    public function testDateWithoutFormatShouldValidate()
+    public function testDateWithoutFormatShouldValidate(): void
     {
         self::assertTrue($this->dateValidator->__invoke('today'));
     }
 
-    public function testDateTimeInstancesShouldAlwaysValidate()
+    public function testDateTimeInstancesShouldAlwaysValidate(): void
     {
         self::assertTrue($this->dateValidator->__invoke(new \DateTime('today')));
     }
@@ -68,27 +70,29 @@ class DateTimeTest extends TestCase
         self::assertTrue($this->dateValidator->validate(new DateTimeImmutable('today')));
     }
 
-    public function testInvalidDateShouldFail()
+    public function testInvalidDateShouldFail(): void
     {
         self::assertFalse($this->dateValidator->__invoke('aids'));
     }
-    public function testInvalidDateShouldFail_on_invalid_conversions()
+
+    public function testInvalidDateShouldFail_on_invalid_conversions(): void
     {
         $this->dateValidator->format = 'Y-m-d';
         self::assertFalse($this->dateValidator->__invoke('2009-12-00'));
     }
 
-    public function testAnyObjectExceptDateTimeInstancesShouldFail()
+    public function testAnyObjectExceptDateTimeInstancesShouldFail(): void
     {
         self::assertFalse($this->dateValidator->__invoke(new \stdClass()));
     }
 
-    public function testFormatsShouldValidateDateStrings()
+    public function testFormatsShouldValidateDateStrings(): void
     {
         $this->dateValidator = new DateTime('Y-m-d');
         self::assertTrue($this->dateValidator->assert('2009-09-09'));
     }
-    public function testFormatsShouldValidateDateStrings_with_any_formats()
+
+    public function testFormatsShouldValidateDateStrings_with_any_formats(): void
     {
         $this->dateValidator = new DateTime('d/m/Y');
         self::assertTrue($this->dateValidator->assert('23/05/1987'));
@@ -97,13 +101,13 @@ class DateTimeTest extends TestCase
     /**
      * @expectedException \Respect\Validation\Exceptions\DateTimeException
      */
-    public function testFormatsShouldValidateDateStrings_and_throw_DateTimeException_on_failure()
+    public function testFormatsShouldValidateDateStrings_and_throw_DateTimeException_on_failure(): void
     {
         $this->dateValidator = new DateTime('y-m-d');
         self::assertFalse($this->dateValidator->assert('2009-09-09'));
     }
 
-    public function testDateTimeExceptionalFormatsThatShouldBeValid()
+    public function testDateTimeExceptionalFormatsThatShouldBeValid(): void
     {
         $this->dateValidator = new DateTime('c');
         self::assertTrue($this->dateValidator->assert('2004-02-12T15:19:21+00:00'));
@@ -119,7 +123,7 @@ class DateTimeTest extends TestCase
      * @param string $input
      * @dataProvider providerForDateTimeTimezoneStrings
      */
-    public function testDateTimeSystemTimezoneIndependent($systemTimezone, $format, $input)
+    public function testDateTimeSystemTimezoneIndependent($systemTimezone, $format, $input): void
     {
         date_default_timezone_set($systemTimezone);
         $this->dateValidator = new DateTime($format);
diff --git a/tests/unit/Rules/DigitTest.php b/tests/unit/Rules/DigitTest.php
index 6f28897b..eafd25db 100644
--- a/tests/unit/Rules/DigitTest.php
+++ b/tests/unit/Rules/DigitTest.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 use PHPUnit\Framework\TestCase;
@@ -23,7 +25,7 @@ class DigitTest extends TestCase
     /**
      * @dataProvider providerForValidDigits
      */
-    public function testValidDataWithDigitsShouldReturnTrue($validDigits, $additional = '')
+    public function testValidDataWithDigitsShouldReturnTrue($validDigits, $additional = ''): void
     {
         $validator = new Digit($additional);
         self::assertTrue($validator->validate($validDigits));
@@ -33,7 +35,7 @@ class DigitTest extends TestCase
      * @dataProvider providerForInvalidDigits
      * @expectedException \Respect\Validation\Exceptions\DigitException
      */
-    public function testInvalidDigitsShouldFailAndThrowDigitException($invalidDigits, $additional = '')
+    public function testInvalidDigitsShouldFailAndThrowDigitException($invalidDigits, $additional = ''): void
     {
         $validator = new Digit($additional);
         self::assertFalse($validator->validate($invalidDigits));
@@ -44,7 +46,7 @@ class DigitTest extends TestCase
      * @dataProvider providerForInvalidParams
      * @expectedException \Respect\Validation\Exceptions\ComponentException
      */
-    public function testInvalidConstructorParamsShouldThrowComponentExceptionUponInstantiation($additional)
+    public function testInvalidConstructorParamsShouldThrowComponentExceptionUponInstantiation($additional): void
     {
         $validator = new Digit($additional);
     }
@@ -52,7 +54,7 @@ class DigitTest extends TestCase
     /**
      * @dataProvider providerAdditionalChars
      */
-    public function testAdditionalCharsShouldBeRespected($additional, $query)
+    public function testAdditionalCharsShouldBeRespected($additional, $query): void
     {
         $validator = new Digit($additional);
         self::assertTrue($validator->validate($query));
diff --git a/tests/unit/Rules/DirectoryTest.php b/tests/unit/Rules/DirectoryTest.php
index 3684cf8f..2dfa63c5 100644
--- a/tests/unit/Rules/DirectoryTest.php
+++ b/tests/unit/Rules/DirectoryTest.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 use PHPUnit\Framework\TestCase;
@@ -23,7 +25,7 @@ class DirectoryTest extends TestCase
     /**
      * @dataProvider providerForValidDirectory
      */
-    public function testValidDirectoryShouldReturnTrue($input)
+    public function testValidDirectoryShouldReturnTrue($input): void
     {
         $rule = new Directory();
         self::assertTrue($rule->__invoke($input));
@@ -35,7 +37,7 @@ class DirectoryTest extends TestCase
      * @dataProvider providerForInvalidDirectory
      * @expectedException \Respect\Validation\Exceptions\DirectoryException
      */
-    public function testInvalidDirectoryShouldThrowException($input)
+    public function testInvalidDirectoryShouldThrowException($input): void
     {
         $rule = new Directory();
         self::assertFalse($rule->__invoke($input));
@@ -46,7 +48,7 @@ class DirectoryTest extends TestCase
     /**
      * @dataProvider providerForDirectoryObjects
      */
-    public function testDirectoryWithObjects($object, $valid)
+    public function testDirectoryWithObjects($object, $valid): void
     {
         $rule = new Directory();
         self::assertEquals($valid, $rule->validate($object));
diff --git a/tests/unit/Rules/DomainTest.php b/tests/unit/Rules/DomainTest.php
index b4b6d0e2..06151566 100644
--- a/tests/unit/Rules/DomainTest.php
+++ b/tests/unit/Rules/DomainTest.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 use PHPUnit\Framework\TestCase;
@@ -23,7 +25,7 @@ class DomainTest extends TestCase
 {
     protected $object;
 
-    protected function setUp()
+    protected function setUp(): void
     {
         $this->object = new Domain();
     }
@@ -31,7 +33,7 @@ class DomainTest extends TestCase
     /**
      * @dataProvider providerForDomain
      */
-    public function testValidDomainsShouldReturnTrue($input, $tldcheck = true)
+    public function testValidDomainsShouldReturnTrue($input, $tldcheck = true): void
     {
         $this->object->tldCheck($tldcheck);
         self::assertTrue($this->object->__invoke($input));
@@ -43,7 +45,7 @@ class DomainTest extends TestCase
      * @dataProvider providerForNotDomain
      * @expectedException \Respect\Validation\Exceptions\ValidationException
      */
-    public function testNotDomain($input, $tldcheck = true)
+    public function testNotDomain($input, $tldcheck = true): void
     {
         $this->object->tldCheck($tldcheck);
         self::assertFalse($this->object->check($input));
@@ -53,7 +55,7 @@ class DomainTest extends TestCase
      * @dataProvider providerForNotDomain
      * @expectedException \Respect\Validation\Exceptions\DomainException
      */
-    public function testNotDomainCheck($input, $tldcheck = true)
+    public function testNotDomainCheck($input, $tldcheck = true): void
     {
         $this->object->tldCheck($tldcheck);
         self::assertFalse($this->object->assert($input));
@@ -92,7 +94,7 @@ class DomainTest extends TestCase
     /**
      * @dataProvider providerForDomain
      */
-    public function testBuilder($validDomain, $checkTLD = true)
+    public function testBuilder($validDomain, $checkTLD = true): void
     {
         self::assertTrue(
             v::domain($checkTLD)->validate($validDomain),
diff --git a/tests/unit/Rules/EachTest.php b/tests/unit/Rules/EachTest.php
index 02c196f5..78f1f137 100644
--- a/tests/unit/Rules/EachTest.php
+++ b/tests/unit/Rules/EachTest.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 /**
@@ -59,7 +61,7 @@ class EachTest extends RuleTestCase
         ];
     }
 
-    public function testValidatorShouldPassIfEveryArrayItemPass()
+    public function testValidatorShouldPassIfEveryArrayItemPass(): void
     {
         $v = new Each($this->getRuleMock(true));
         $result = $v->check([1, 2, 3, 4, 5]);
@@ -68,7 +70,7 @@ class EachTest extends RuleTestCase
         self::assertTrue($result);
     }
 
-    public function testValidatorShouldPassIfEveryArrayItemAndKeyPass()
+    public function testValidatorShouldPassIfEveryArrayItemAndKeyPass(): void
     {
         $v = new Each($this->getRuleMock(true), $this->getRuleMock(true));
         $result = $v->check(['a', 'b', 'c', 'd', 'e']);
@@ -77,7 +79,7 @@ class EachTest extends RuleTestCase
         self::assertTrue($result);
     }
 
-    public function testValidatorShouldPassWithOnlyKeyValidation()
+    public function testValidatorShouldPassWithOnlyKeyValidation(): void
     {
         $v = new Each(null, $this->getRuleMock(true));
         $result = $v->check(['a', 'b', 'c', 'd', 'e']);
@@ -89,7 +91,7 @@ class EachTest extends RuleTestCase
     /**
      * @expectedException \Respect\Validation\Exceptions\EachException
      */
-    public function testValidatorShouldNotPassWithOnlyKeyValidation()
+    public function testValidatorShouldNotPassWithOnlyKeyValidation(): void
     {
         $v = new Each(null, $this->getRuleMock(false));
         $v->assert(['a', 'b', 'c', 'd', 'e']);
@@ -98,7 +100,7 @@ class EachTest extends RuleTestCase
     /**
      * @expectedException \Respect\Validation\Exceptions\EachException
      */
-    public function testAssertShouldFailOnInvalidItem()
+    public function testAssertShouldFailOnInvalidItem(): void
     {
         $v = new Each($this->getRuleMock(false));
         $v->assert(['a', 2, 3, 4, 5]);
@@ -107,7 +109,7 @@ class EachTest extends RuleTestCase
     /**
      * @expectedException \Respect\Validation\Exceptions\EachException
      */
-    public function testAssertShouldFailWithNonIterableInput()
+    public function testAssertShouldFailWithNonIterableInput(): void
     {
         $v = new Each($this->getRuleMock(false));
         $v->assert('a');
@@ -116,7 +118,7 @@ class EachTest extends RuleTestCase
     /**
      * @expectedException \Respect\Validation\Exceptions\EachException
      */
-    public function testCheckShouldFailWithNonIterableInput()
+    public function testCheckShouldFailWithNonIterableInput(): void
     {
         $v = new Each($this->getRuleMock(false));
         $v->check(null);
diff --git a/tests/unit/Rules/EmailTest.php b/tests/unit/Rules/EmailTest.php
index ea53a5c8..c1c34758 100644
--- a/tests/unit/Rules/EmailTest.php
+++ b/tests/unit/Rules/EmailTest.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 use Egulias\EmailValidator\EmailValidator;
@@ -31,13 +33,13 @@ function class_exists($className)
  */
 class EmailTest extends TestCase
 {
-    private function setEmailValidatorExists($value)
+    private function setEmailValidatorExists($value): void
     {
         $GLOBALS['class_exists'][EmailValidator::class] = (bool) $value;
         $GLOBALS['class_exists'][RFCValidation::class] = (bool) $value;
     }
 
-    private function resetClassExists()
+    private function resetClassExists(): void
     {
         unset($GLOBALS['class_exists']);
     }
@@ -52,17 +54,17 @@ class EmailTest extends TestCase
         return $emailValidatorMock;
     }
 
-    protected function setUp()
+    protected function setUp(): void
     {
         $this->setEmailValidatorExists(false);
     }
 
-    protected function tearDown()
+    protected function tearDown(): void
     {
         $this->resetClassExists();
     }
 
-    public function testShouldAcceptInstanceOfEmailValidatorOnConstructor()
+    public function testShouldAcceptInstanceOfEmailValidatorOnConstructor(): void
     {
         $this->resetClassExists();
 
@@ -73,7 +75,7 @@ class EmailTest extends TestCase
         self::assertSame($emailValidator, $rule->getEmailValidator());
     }
 
-    public function testShouldHaveADefaultInstanceOfEmailValidator()
+    public function testShouldHaveADefaultInstanceOfEmailValidator(): void
     {
         $this->resetClassExists();
 
@@ -82,7 +84,7 @@ class EmailTest extends TestCase
         self::assertInstanceOf(EmailValidator::class, $rule->getEmailValidator());
     }
 
-    public function testShouldUseEmailValidatorWhenDefined()
+    public function testShouldUseEmailValidatorWhenDefined(): void
     {
         $this->resetClassExists();
 
@@ -103,7 +105,7 @@ class EmailTest extends TestCase
     /**
      * @dataProvider providerForValidEmail
      */
-    public function testValidEmailShouldPass($validEmail)
+    public function testValidEmailShouldPass($validEmail): void
     {
         $validator = new Email();
         self::assertTrue($validator->__invoke($validEmail));
@@ -115,7 +117,7 @@ class EmailTest extends TestCase
      * @dataProvider providerForInvalidEmail
      * @expectedException \Respect\Validation\Exceptions\EmailException
      */
-    public function testInvalidEmailsShouldFailValidation($invalidEmail)
+    public function testInvalidEmailsShouldFailValidation($invalidEmail): void
     {
         $validator = new Email();
         self::assertFalse($validator->__invoke($invalidEmail));
diff --git a/tests/unit/Rules/EndsWithTest.php b/tests/unit/Rules/EndsWithTest.php
index bbb4e724..0c6952d3 100644
--- a/tests/unit/Rules/EndsWithTest.php
+++ b/tests/unit/Rules/EndsWithTest.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 use PHPUnit\Framework\TestCase;
@@ -23,7 +25,7 @@ class EndsWithTest extends TestCase
     /**
      * @dataProvider providerForEndsWith
      */
-    public function testStringsEndingWithExpectedValueShouldPass($start, $input)
+    public function testStringsEndingWithExpectedValueShouldPass($start, $input): void
     {
         $v = new EndsWith($start);
         self::assertTrue($v->__invoke($input));
@@ -35,7 +37,7 @@ class EndsWithTest extends TestCase
      * @dataProvider providerForNotEndsWith
      * @expectedException \Respect\Validation\Exceptions\EndsWithException
      */
-    public function testStringsNotEndingWithExpectedValueShouldNotPass($start, $input, $caseSensitive = false)
+    public function testStringsNotEndingWithExpectedValueShouldNotPass($start, $input, $caseSensitive = false): void
     {
         $v = new EndsWith($start, $caseSensitive);
         self::assertFalse($v->__invoke($input));
diff --git a/tests/unit/Rules/EqualsTest.php b/tests/unit/Rules/EqualsTest.php
index 85a1d625..38ea49f9 100644
--- a/tests/unit/Rules/EqualsTest.php
+++ b/tests/unit/Rules/EqualsTest.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 use PHPUnit\Framework\TestCase;
@@ -24,7 +26,7 @@ class EqualsTest extends TestCase
     /**
      * @dataProvider providerForEquals
      */
-    public function testInputEqualsToExpectedValueShouldPass($compareTo, $input)
+    public function testInputEqualsToExpectedValueShouldPass($compareTo, $input): void
     {
         $rule = new Equals($compareTo);
 
@@ -34,7 +36,7 @@ class EqualsTest extends TestCase
     /**
      * @dataProvider providerForNotEquals
      */
-    public function testInputNotEqualsToExpectedValueShouldPass($compareTo, $input)
+    public function testInputNotEqualsToExpectedValueShouldPass($compareTo, $input): void
     {
         $rule = new Equals($compareTo);
 
@@ -45,7 +47,7 @@ class EqualsTest extends TestCase
      * @expectedException \Respect\Validation\Exceptions\EqualsException
      * @expectedExceptionMessage "24" must equal 42
      */
-    public function testShouldThrowTheProperExceptionWhenFailure()
+    public function testShouldThrowTheProperExceptionWhenFailure(): void
     {
         $rule = new Equals(42);
         $rule->check('24');
diff --git a/tests/unit/Rules/EvenTest.php b/tests/unit/Rules/EvenTest.php
index f3e0d74c..e0720341 100644
--- a/tests/unit/Rules/EvenTest.php
+++ b/tests/unit/Rules/EvenTest.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 use PHPUnit\Framework\TestCase;
@@ -22,7 +24,7 @@ class EvenTest extends TestCase
 {
     protected $evenValidator;
 
-    protected function setUp()
+    protected function setUp(): void
     {
         $this->evenValidator = new Even();
     }
@@ -30,7 +32,7 @@ class EvenTest extends TestCase
     /**
      * @dataProvider providerForEven
      */
-    public function testEvenNumbersShouldPass($input)
+    public function testEvenNumbersShouldPass($input): void
     {
         self::assertTrue($this->evenValidator->validate($input));
         self::assertTrue($this->evenValidator->check($input));
@@ -41,7 +43,7 @@ class EvenTest extends TestCase
      * @dataProvider providerForNotEven
      * @expectedException \Respect\Validation\Exceptions\EvenException
      */
-    public function testNotEvenNumbersShouldFail($input)
+    public function testNotEvenNumbersShouldFail($input): void
     {
         self::assertFalse($this->evenValidator->validate($input));
         self::assertFalse($this->evenValidator->assert($input));
diff --git a/tests/unit/Rules/ExecutableTest.php b/tests/unit/Rules/ExecutableTest.php
index bedce7ac..0fdd5420 100644
--- a/tests/unit/Rules/ExecutableTest.php
+++ b/tests/unit/Rules/ExecutableTest.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 use PHPUnit\Framework\TestCase;
@@ -33,7 +35,7 @@ function is_executable($executable)
  */
 class ExecutableTest extends TestCase
 {
-    public function testValidExecutableFileShouldReturnTrue()
+    public function testValidExecutableFileShouldReturnTrue(): void
     {
         $GLOBALS['is_executable'] = true;
 
@@ -42,7 +44,7 @@ class ExecutableTest extends TestCase
         self::assertTrue($rule->validate($input));
     }
 
-    public function testInvalidExecutableFileShouldReturnFalse()
+    public function testInvalidExecutableFileShouldReturnFalse(): void
     {
         $GLOBALS['is_executable'] = false;
 
@@ -51,7 +53,7 @@ class ExecutableTest extends TestCase
         self::assertFalse($rule->validate($input));
     }
 
-    public function testShouldValidateObjects()
+    public function testShouldValidateObjects(): void
     {
         $rule = new Executable();
         $object = $this->createMock('SplFileInfo', ['isExecutable'], ['somefile.txt']);
diff --git a/tests/unit/Rules/ExistsTest.php b/tests/unit/Rules/ExistsTest.php
index 7f57689d..333eb42c 100644
--- a/tests/unit/Rules/ExistsTest.php
+++ b/tests/unit/Rules/ExistsTest.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 use org\bovigo\vfs\content\LargeFileContent;
@@ -27,7 +29,7 @@ class ExistsTest extends TestCase
      * @dataProvider fileProvider
      * @covers \Respect\Validation\Rules\Exists::validate
      */
-    public function testExistentFileShouldReturnTrue($file)
+    public function testExistentFileShouldReturnTrue($file): void
     {
         $rule = new Exists();
         self::assertTrue($rule->validate($file->url()));
@@ -36,7 +38,7 @@ class ExistsTest extends TestCase
     /**
      * @covers \Respect\Validation\Rules\Exists::validate
      */
-    public function testNonExistentFileShouldReturnFalse()
+    public function testNonExistentFileShouldReturnFalse(): void
     {
         $rule = new Exists();
         self::assertFalse($rule->validate('/path/of/a/non-existent/file'));
@@ -46,7 +48,7 @@ class ExistsTest extends TestCase
      * @dataProvider fileProvider
      * @covers \Respect\Validation\Rules\Exists::validate
      */
-    public function testShouldValidateObjects($file)
+    public function testShouldValidateObjects($file): void
     {
         $rule = new Exists();
         $object = new SplFileInfo($file->url());
diff --git a/tests/unit/Rules/ExtensionTest.php b/tests/unit/Rules/ExtensionTest.php
index 99f3ed00..328beea6 100644
--- a/tests/unit/Rules/ExtensionTest.php
+++ b/tests/unit/Rules/ExtensionTest.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 use PHPUnit\Framework\TestCase;
@@ -35,14 +37,14 @@ class ExtensionTest extends TestCase
     /**
      * @dataProvider providerValidExtension
      */
-    public function testShouldValidateExtension($filename, $extension)
+    public function testShouldValidateExtension($filename, $extension): void
     {
         $rule = new Extension($extension);
 
         self::assertTrue($rule->validate($filename));
     }
 
-    public function testShouldAcceptSplFileInfo()
+    public function testShouldAcceptSplFileInfo(): void
     {
         $fileInfo = new SplFileInfo(__FILE__);
 
@@ -51,7 +53,7 @@ class ExtensionTest extends TestCase
         self::assertTrue($rule->validate($fileInfo));
     }
 
-    public function testShouldInvalidWhenNotStringNorSplFileInfo()
+    public function testShouldInvalidWhenNotStringNorSplFileInfo(): void
     {
         $nonFile = [__FILE__];
 
@@ -64,7 +66,7 @@ class ExtensionTest extends TestCase
      * @expectedException \Respect\Validation\Exceptions\ExtensionException
      * @expectedExceptionMessage "filename.jpg" must have "png" extension
      */
-    public function testShouldThrowExtensionExceptionWhenCheckingValue()
+    public function testShouldThrowExtensionExceptionWhenCheckingValue(): void
     {
         $rule = new Extension('png');
         $rule->check('filename.jpg');
diff --git a/tests/unit/Rules/FactorTest.php b/tests/unit/Rules/FactorTest.php
index a76c6d83..53b544ad 100644
--- a/tests/unit/Rules/FactorTest.php
+++ b/tests/unit/Rules/FactorTest.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 use PHPUnit\Framework\TestCase;
@@ -28,7 +30,7 @@ class FactorTest extends TestCase
     /**
      * @dataProvider providerForValidFactor
      */
-    public function testValidFactorShouldReturnTrue($dividend, $input)
+    public function testValidFactorShouldReturnTrue($dividend, $input): void
     {
         $min = new Factor($dividend);
         self::assertTrue($min->__invoke($input));
@@ -39,7 +41,7 @@ class FactorTest extends TestCase
     /**
      * @dataProvider providerForInvalidFactor
      */
-    public function testInvalidFactorShouldThrowFactorException($dividend, $input)
+    public function testInvalidFactorShouldThrowFactorException($dividend, $input): void
     {
         $this->expectException(
             FactorException::class,
@@ -54,7 +56,7 @@ class FactorTest extends TestCase
     /**
      * @dataProvider providerForInvalidFactorDividend
      */
-    public function testInvalidDividentShouldThrowComponentException($dividend, $input)
+    public function testInvalidDividentShouldThrowComponentException($dividend, $input): void
     {
         $this->expectException(
             ComponentException::class,
diff --git a/tests/unit/Rules/FalseValTest.php b/tests/unit/Rules/FalseValTest.php
index ea0914bb..366d1bd7 100644
--- a/tests/unit/Rules/FalseValTest.php
+++ b/tests/unit/Rules/FalseValTest.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 use PHPUnit\Framework\TestCase;
@@ -23,7 +25,7 @@ class FalseValTest extends TestCase
     /**
      * @dataProvider validFalseProvider
      */
-    public function testShouldValidatePatternAccordingToTheDefinedLocale($input)
+    public function testShouldValidatePatternAccordingToTheDefinedLocale($input): void
     {
         $rule = new FalseVal();
 
@@ -51,7 +53,7 @@ class FalseValTest extends TestCase
     /**
      * @dataProvider invalidFalseProvider
      */
-    public function testShouldNotValidatePatternAccordingToTheDefinedLocale($input)
+    public function testShouldNotValidatePatternAccordingToTheDefinedLocale($input): void
     {
         $rule = new FalseVal();
 
diff --git a/tests/unit/Rules/FibonacciTest.php b/tests/unit/Rules/FibonacciTest.php
index 5ab63d10..fde9ac00 100644
--- a/tests/unit/Rules/FibonacciTest.php
+++ b/tests/unit/Rules/FibonacciTest.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 /**
diff --git a/tests/unit/Rules/FileTest.php b/tests/unit/Rules/FileTest.php
index 2f4934cd..4e0069bb 100644
--- a/tests/unit/Rules/FileTest.php
+++ b/tests/unit/Rules/FileTest.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 use PHPUnit\Framework\TestCase;
@@ -36,7 +38,7 @@ class FileTest extends TestCase
     /**
      * @covers \Respect\Validation\Rules\File::validate
      */
-    public function testValidFileShouldReturnTrue()
+    public function testValidFileShouldReturnTrue(): void
     {
         $GLOBALS['is_file'] = true;
 
@@ -48,7 +50,7 @@ class FileTest extends TestCase
     /**
      * @covers \Respect\Validation\Rules\File::validate
      */
-    public function testInvalidFileShouldReturnFalse()
+    public function testInvalidFileShouldReturnFalse(): void
     {
         $GLOBALS['is_file'] = false;
 
@@ -60,7 +62,7 @@ class FileTest extends TestCase
     /**
      * @covers \Respect\Validation\Rules\File::validate
      */
-    public function testShouldValidateObjects()
+    public function testShouldValidateObjects(): void
     {
         $rule = new File();
         $object = $this->createMock('SplFileInfo', ['isFile'], ['somefile.txt']);
diff --git a/tests/unit/Rules/FilterVarTest.php b/tests/unit/Rules/FilterVarTest.php
index b0ae5681..3cc993d4 100644
--- a/tests/unit/Rules/FilterVarTest.php
+++ b/tests/unit/Rules/FilterVarTest.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 use PHPUnit\Framework\TestCase;
@@ -24,7 +26,7 @@ class FilterVarTest extends TestCase
      * @expectedException \Respect\Validation\Exceptions\ComponentException
      * @expectedExceptionMessage Cannot validate without filter flag
      */
-    public function testShouldThrowsExceptionWhenFilterIsNotDefined()
+    public function testShouldThrowsExceptionWhenFilterIsNotDefined(): void
     {
         new FilterVar();
     }
@@ -33,12 +35,12 @@ class FilterVarTest extends TestCase
      * @expectedException \Respect\Validation\Exceptions\ComponentException
      * @expectedExceptionMessage Cannot accept the given filter
      */
-    public function testShouldThrowsExceptionWhenFilterIsNotValid()
+    public function testShouldThrowsExceptionWhenFilterIsNotValid(): void
     {
         new FilterVar(FILTER_SANITIZE_EMAIL);
     }
 
-    public function testShouldDefineFilterOnConstructor()
+    public function testShouldDefineFilterOnConstructor(): void
     {
         $rule = new FilterVar(FILTER_VALIDATE_REGEXP);
 
@@ -48,7 +50,7 @@ class FilterVarTest extends TestCase
         self::assertEquals($expectedArguments, $actualArguments);
     }
 
-    public function testShouldDefineFilterOptionsOnConstructor()
+    public function testShouldDefineFilterOptionsOnConstructor(): void
     {
         $rule = new FilterVar(FILTER_VALIDATE_URL, FILTER_FLAG_PATH_REQUIRED);
 
@@ -58,14 +60,14 @@ class FilterVarTest extends TestCase
         self::assertEquals($expectedArguments, $actualArguments);
     }
 
-    public function testShouldUseDefineFilterToValidate()
+    public function testShouldUseDefineFilterToValidate(): void
     {
         $rule = new FilterVar(FILTER_VALIDATE_EMAIL);
 
         self::assertTrue($rule->validate('henriquemoody@users.noreply.github.com'));
     }
 
-    public function testShouldUseDefineFilterOptionsToValidate()
+    public function testShouldUseDefineFilterOptionsToValidate(): void
     {
         $rule = new FilterVar(FILTER_VALIDATE_URL, FILTER_FLAG_QUERY_REQUIRED);
 
diff --git a/tests/unit/Rules/FiniteTest.php b/tests/unit/Rules/FiniteTest.php
index ffe8467c..17e6635a 100644
--- a/tests/unit/Rules/FiniteTest.php
+++ b/tests/unit/Rules/FiniteTest.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 use PHPUnit\Framework\TestCase;
@@ -22,7 +24,7 @@ class FiniteTest extends TestCase
 {
     protected $rule;
 
-    protected function setUp()
+    protected function setUp(): void
     {
         $this->rule = new Finite();
     }
@@ -30,7 +32,7 @@ class FiniteTest extends TestCase
     /**
      * @dataProvider providerForFinite
      */
-    public function testShouldValidateFiniteNumbers($input)
+    public function testShouldValidateFiniteNumbers($input): void
     {
         self::assertTrue($this->rule->validate($input));
     }
@@ -38,7 +40,7 @@ class FiniteTest extends TestCase
     /**
      * @dataProvider providerForNonFinite
      */
-    public function testShouldNotValidateNonFiniteNumbers($input)
+    public function testShouldNotValidateNonFiniteNumbers($input): void
     {
         self::assertFalse($this->rule->validate($input));
     }
@@ -47,7 +49,7 @@ class FiniteTest extends TestCase
      * @expectedException \Respect\Validation\Exceptions\FiniteException
      * @expectedExceptionMessage INF must be a finite number
      */
-    public function testShouldThrowFiniteExceptionWhenChecking()
+    public function testShouldThrowFiniteExceptionWhenChecking(): void
     {
         $this->rule->check(INF);
     }
diff --git a/tests/unit/Rules/FloatTypeTest.php b/tests/unit/Rules/FloatTypeTest.php
index 81fb7f51..935d797d 100644
--- a/tests/unit/Rules/FloatTypeTest.php
+++ b/tests/unit/Rules/FloatTypeTest.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 /**
diff --git a/tests/unit/Rules/FloatValTest.php b/tests/unit/Rules/FloatValTest.php
index 4862776b..4f0cff96 100644
--- a/tests/unit/Rules/FloatValTest.php
+++ b/tests/unit/Rules/FloatValTest.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 use PHPUnit\Framework\TestCase;
@@ -22,7 +24,7 @@ class FloatValTest extends TestCase
 {
     protected $floatValidator;
 
-    protected function setUp()
+    protected function setUp(): void
     {
         $this->floatValidator = new FloatVal();
     }
@@ -30,7 +32,7 @@ class FloatValTest extends TestCase
     /**
      * @dataProvider providerForFloat
      */
-    public function testFloatNumbersShouldPass($input)
+    public function testFloatNumbersShouldPass($input): void
     {
         self::assertTrue($this->floatValidator->assert($input));
         self::assertTrue($this->floatValidator->__invoke($input));
@@ -41,7 +43,7 @@ class FloatValTest extends TestCase
      * @dataProvider providerForNotFloat
      * @expectedException \Respect\Validation\Exceptions\FloatValException
      */
-    public function testNotFloatNumbersShouldFail($input)
+    public function testNotFloatNumbersShouldFail($input): void
     {
         self::assertFalse($this->floatValidator->__invoke($input));
         self::assertFalse($this->floatValidator->assert($input));
diff --git a/tests/unit/Rules/GraphTest.php b/tests/unit/Rules/GraphTest.php
index 8903ec66..6a13c5ea 100644
--- a/tests/unit/Rules/GraphTest.php
+++ b/tests/unit/Rules/GraphTest.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 use PHPUnit\Framework\TestCase;
@@ -23,7 +25,7 @@ class GraphTest extends TestCase
     /**
      * @dataProvider providerForValidGraph
      */
-    public function testValidDataWithGraphCharsShouldReturnTrue($validGraph, $additional = '')
+    public function testValidDataWithGraphCharsShouldReturnTrue($validGraph, $additional = ''): void
     {
         $validator = new Graph($additional);
         self::assertTrue($validator->validate($validGraph));
@@ -33,7 +35,7 @@ class GraphTest extends TestCase
      * @dataProvider providerForInvalidGraph
      * @expectedException \Respect\Validation\Exceptions\GraphException
      */
-    public function testInvalidGraphShouldFailAndThrowGraphException($invalidGraph, $additional = '')
+    public function testInvalidGraphShouldFailAndThrowGraphException($invalidGraph, $additional = ''): void
     {
         $validator = new Graph($additional);
         self::assertFalse($validator->validate($invalidGraph));
@@ -44,7 +46,7 @@ class GraphTest extends TestCase
      * @dataProvider providerForInvalidParams
      * @expectedException \Respect\Validation\Exceptions\ComponentException
      */
-    public function testInvalidConstructorParamsShouldThrowComponentExceptionUponInstantiation($additional)
+    public function testInvalidConstructorParamsShouldThrowComponentExceptionUponInstantiation($additional): void
     {
         $validator = new Graph($additional);
     }
@@ -52,7 +54,7 @@ class GraphTest extends TestCase
     /**
      * @dataProvider providerAdditionalChars
      */
-    public function testAdditionalCharsShouldBeRespected($additional, $query)
+    public function testAdditionalCharsShouldBeRespected($additional, $query): void
     {
         $validator = new Graph($additional);
         self::assertTrue($validator->validate($query));
diff --git a/tests/unit/Rules/HexRgbColorTest.php b/tests/unit/Rules/HexRgbColorTest.php
index 1bf513aa..143d465c 100644
--- a/tests/unit/Rules/HexRgbColorTest.php
+++ b/tests/unit/Rules/HexRgbColorTest.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 use PHPUnit\Framework\TestCase;
@@ -23,7 +25,7 @@ class HexRgbColorTest extends TestCase
     /**
      * @dataProvider providerForValidHexRgbColor
      */
-    public function testHexRgbColorValuesONLYShouldReturnTrue($validHexRgbColor)
+    public function testHexRgbColorValuesONLYShouldReturnTrue($validHexRgbColor): void
     {
         $validator = new HexRgbColor();
 
@@ -33,7 +35,7 @@ class HexRgbColorTest extends TestCase
     /**
      * @dataProvider providerForInvalidHexRgbColor
      */
-    public function testInvalidHexRgbColorValuesShouldReturnFalse($invalidHexRgbColor)
+    public function testInvalidHexRgbColorValuesShouldReturnFalse($invalidHexRgbColor): void
     {
         $validator = new HexRgbColor();
 
diff --git a/tests/unit/Rules/IdenticalTest.php b/tests/unit/Rules/IdenticalTest.php
index a5159df8..b08f67f4 100644
--- a/tests/unit/Rules/IdenticalTest.php
+++ b/tests/unit/Rules/IdenticalTest.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 use PHPUnit\Framework\TestCase;
@@ -24,7 +26,7 @@ class IdenticalTest extends TestCase
     /**
      * @dataProvider providerForIdentical
      */
-    public function testInputIdenticalToExpectedValueShouldPass($compareTo, $input)
+    public function testInputIdenticalToExpectedValueShouldPass($compareTo, $input): void
     {
         $rule = new Identical($compareTo);
 
@@ -34,7 +36,7 @@ class IdenticalTest extends TestCase
     /**
      * @dataProvider providerForNotIdentical
      */
-    public function testInputNotIdenticalToExpectedValueShouldPass($compareTo, $input)
+    public function testInputNotIdenticalToExpectedValueShouldPass($compareTo, $input): void
     {
         $rule = new Identical($compareTo);
 
@@ -45,7 +47,7 @@ class IdenticalTest extends TestCase
      * @expectedException \Respect\Validation\Exceptions\IdenticalException
      * @expectedExceptionMessage "42" must be identical as 42
      */
-    public function testShouldThrowTheProperExceptionWhenFailure()
+    public function testShouldThrowTheProperExceptionWhenFailure(): void
     {
         $rule = new Identical(42);
         $rule->check('42');
diff --git a/tests/unit/Rules/ImageTest.php b/tests/unit/Rules/ImageTest.php
index 29caa1d7..d27d79e7 100644
--- a/tests/unit/Rules/ImageTest.php
+++ b/tests/unit/Rules/ImageTest.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 use finfo;
@@ -21,7 +23,7 @@ use SplFileObject;
  */
 class ImageTest extends RuleTestCase
 {
-    public function testShouldAcceptAnInstanceOfFinfoOnConstructor()
+    public function testShouldAcceptAnInstanceOfFinfoOnConstructor(): void
     {
         $finfo = new finfo(FILEINFO_MIME_TYPE);
         $rule = new Image($finfo);
@@ -29,7 +31,7 @@ class ImageTest extends RuleTestCase
         self::assertSame($rule->fileInfo, $finfo);
     }
 
-    public function testShouldHaveAnInstanceOfFinfoByDefault()
+    public function testShouldHaveAnInstanceOfFinfoByDefault(): void
     {
         $rule = new Image();
 
diff --git a/tests/unit/Rules/ImeiTest.php b/tests/unit/Rules/ImeiTest.php
index 5f72cffd..dfa2ffed 100644
--- a/tests/unit/Rules/ImeiTest.php
+++ b/tests/unit/Rules/ImeiTest.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 /**
diff --git a/tests/unit/Rules/InTest.php b/tests/unit/Rules/InTest.php
index e187cf5a..2a71f135 100644
--- a/tests/unit/Rules/InTest.php
+++ b/tests/unit/Rules/InTest.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 use PHPUnit\Framework\TestCase;
@@ -23,7 +25,7 @@ class InTest extends TestCase
     /**
      * @dataProvider providerForIn
      */
-    public function testSuccessInValidatorCases($input, $options = null)
+    public function testSuccessInValidatorCases($input, $options = null): void
     {
         $v = new In($options);
         self::assertTrue($v->__invoke($input));
@@ -35,7 +37,7 @@ class InTest extends TestCase
      * @dataProvider providerForNotIn
      * @expectedException \Respect\Validation\Exceptions\InException
      */
-    public function testInvalidInChecksShouldThrowInException($input, $options, $strict = false)
+    public function testInvalidInChecksShouldThrowInException($input, $options, $strict = false): void
     {
         $v = new In($options, $strict);
         self::assertFalse($v->__invoke($input));
@@ -46,7 +48,7 @@ class InTest extends TestCase
      * @expectedException \Respect\Validation\Exceptions\InException
      * @expectedExceptionMessage "x" must be in { "foo", "bar" }
      */
-    public function testInCheckExceptionMessageWithArray()
+    public function testInCheckExceptionMessageWithArray(): void
     {
         $v = new In(['foo', 'bar']);
         $v->assert('x');
diff --git a/tests/unit/Rules/InfiniteTest.php b/tests/unit/Rules/InfiniteTest.php
index 9f96d457..90c2593c 100644
--- a/tests/unit/Rules/InfiniteTest.php
+++ b/tests/unit/Rules/InfiniteTest.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 use PHPUnit\Framework\TestCase;
@@ -22,7 +24,7 @@ class InfiniteTest extends TestCase
 {
     protected $rule;
 
-    protected function setUp()
+    protected function setUp(): void
     {
         $this->rule = new Infinite();
     }
@@ -30,7 +32,7 @@ class InfiniteTest extends TestCase
     /**
      * @dataProvider providerForInfinite
      */
-    public function testShouldValidateInfiniteNumbers($input)
+    public function testShouldValidateInfiniteNumbers($input): void
     {
         self::assertTrue($this->rule->validate($input));
     }
@@ -38,7 +40,7 @@ class InfiniteTest extends TestCase
     /**
      * @dataProvider providerForNonInfinite
      */
-    public function testShouldNotValidateNonInfiniteNumbers($input)
+    public function testShouldNotValidateNonInfiniteNumbers($input): void
     {
         self::assertFalse($this->rule->validate($input));
     }
@@ -47,7 +49,7 @@ class InfiniteTest extends TestCase
      * @expectedException \Respect\Validation\Exceptions\InfiniteException
      * @expectedExceptionMessage 123456 must be an infinite number
      */
-    public function testShouldThrowInfiniteExceptionWhenChecking()
+    public function testShouldThrowInfiniteExceptionWhenChecking(): void
     {
         $this->rule->check(123456);
     }
diff --git a/tests/unit/Rules/InstanceTest.php b/tests/unit/Rules/InstanceTest.php
index 532547f9..899f20e4 100644
--- a/tests/unit/Rules/InstanceTest.php
+++ b/tests/unit/Rules/InstanceTest.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 use PHPUnit\Framework\TestCase;
@@ -22,12 +24,12 @@ class InstanceTest extends TestCase
 {
     protected $instanceValidator;
 
-    protected function setUp()
+    protected function setUp(): void
     {
         $this->instanceValidator = new Instance('ArrayObject');
     }
 
-    public function testInstanceValidationShouldReturnFalseForEmpty()
+    public function testInstanceValidationShouldReturnFalseForEmpty(): void
     {
         self::assertFalse($this->instanceValidator->__invoke(''));
     }
@@ -35,7 +37,7 @@ class InstanceTest extends TestCase
     /**
      * @expectedException \Respect\Validation\Exceptions\InstanceException
      */
-    public function testInstanceValidationShouldNotAssertEmpty()
+    public function testInstanceValidationShouldNotAssertEmpty(): void
     {
         $this->instanceValidator->assert('');
     }
@@ -43,12 +45,12 @@ class InstanceTest extends TestCase
     /**
      * @expectedException \Respect\Validation\Exceptions\InstanceException
      */
-    public function testInstanceValidationShouldNotCheckEmpty()
+    public function testInstanceValidationShouldNotCheckEmpty(): void
     {
         $this->instanceValidator->check('');
     }
 
-    public function testInstanceValidationShouldReturnTrueForValidInstances()
+    public function testInstanceValidationShouldReturnTrueForValidInstances(): void
     {
         self::assertTrue($this->instanceValidator->__invoke(new \ArrayObject()));
         self::assertTrue($this->instanceValidator->assert(new \ArrayObject()));
@@ -58,7 +60,7 @@ class InstanceTest extends TestCase
     /**
      * @expectedException \Respect\Validation\Exceptions\InstanceException
      */
-    public function testInvalidInstancesShouldThrowInstanceException()
+    public function testInvalidInstancesShouldThrowInstanceException(): void
     {
         self::assertFalse($this->instanceValidator->validate(new \stdClass()));
         self::assertFalse($this->instanceValidator->assert(new \stdClass()));
diff --git a/tests/unit/Rules/IntTypeTest.php b/tests/unit/Rules/IntTypeTest.php
index aa7c7e41..54abbd9a 100644
--- a/tests/unit/Rules/IntTypeTest.php
+++ b/tests/unit/Rules/IntTypeTest.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 use PHPUnit\Framework\TestCase;
@@ -32,7 +34,7 @@ class IntTypeTest extends TestCase
     /**
      * @dataProvider providerForValidIntType
      */
-    public function testShouldValidateInputWhenItIsAValidIntType($input)
+    public function testShouldValidateInputWhenItIsAValidIntType($input): void
     {
         $rule = new IntType();
 
@@ -52,7 +54,7 @@ class IntTypeTest extends TestCase
     /**
      * @dataProvider providerForInvalidIntType
      */
-    public function testShouldInvalidateInputWhenItIsNotAValidIntType($input)
+    public function testShouldInvalidateInputWhenItIsNotAValidIntType($input): void
     {
         $rule = new IntType();
 
diff --git a/tests/unit/Rules/IntValTest.php b/tests/unit/Rules/IntValTest.php
index 47d30306..0a12aeab 100644
--- a/tests/unit/Rules/IntValTest.php
+++ b/tests/unit/Rules/IntValTest.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 use PHPUnit\Framework\TestCase;
@@ -22,7 +24,7 @@ class IntValTest extends TestCase
 {
     protected $intValidator;
 
-    protected function setUp()
+    protected function setUp(): void
     {
         $this->intValidator = new IntVal();
     }
@@ -30,7 +32,7 @@ class IntValTest extends TestCase
     /**
      * @dataProvider providerForInt
      */
-    public function testValidIntegersShouldReturnTrue($input)
+    public function testValidIntegersShouldReturnTrue($input): void
     {
         self::assertTrue($this->intValidator->__invoke($input));
         self::assertTrue($this->intValidator->check($input));
@@ -41,7 +43,7 @@ class IntValTest extends TestCase
      * @dataProvider providerForNotInt
      * @expectedException \Respect\Validation\Exceptions\IntValException
      */
-    public function testInvalidIntegersShouldThrowIntException($input)
+    public function testInvalidIntegersShouldThrowIntException($input): void
     {
         self::assertFalse($this->intValidator->__invoke($input));
         self::assertFalse($this->intValidator->assert($input));
diff --git a/tests/unit/Rules/IpTest.php b/tests/unit/Rules/IpTest.php
index c990d511..2ac21f0c 100644
--- a/tests/unit/Rules/IpTest.php
+++ b/tests/unit/Rules/IpTest.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 use PHPUnit\Framework\TestCase;
@@ -23,7 +25,7 @@ class IpTest extends TestCase
     /**
      * @dataProvider providerForIp
      */
-    public function testValidIpsShouldReturnTrue($input, $options = null)
+    public function testValidIpsShouldReturnTrue($input, $options = null): void
     {
         $ipValidator = new Ip($options);
         self::assertTrue($ipValidator->__invoke($input));
@@ -34,7 +36,7 @@ class IpTest extends TestCase
     /**
      * @dataProvider providerForIpBetweenRange
      */
-    public function testIpsBetweenRangeShouldReturnTrue($input, $networkRange)
+    public function testIpsBetweenRangeShouldReturnTrue($input, $networkRange): void
     {
         $ipValidator = new Ip($networkRange);
         self::assertTrue($ipValidator->__invoke($input));
@@ -46,7 +48,7 @@ class IpTest extends TestCase
      * @dataProvider providerForNotIp
      * @expectedException \Respect\Validation\Exceptions\IpException
      */
-    public function testInvalidIpsShouldThrowIpException($input, $options = null)
+    public function testInvalidIpsShouldThrowIpException($input, $options = null): void
     {
         $ipValidator = new Ip($options);
         self::assertFalse($ipValidator->__invoke($input));
@@ -57,7 +59,7 @@ class IpTest extends TestCase
      * @dataProvider providerForIpOutsideRange
      * @expectedException \Respect\Validation\Exceptions\IpException
      */
-    public function testIpsOutsideRangeShouldReturnFalse($input, $networkRange)
+    public function testIpsOutsideRangeShouldReturnFalse($input, $networkRange): void
     {
         $ipValidator = new Ip($networkRange);
         self::assertFalse($ipValidator->__invoke($input));
@@ -125,7 +127,7 @@ class IpTest extends TestCase
      * @dataProvider providerForInvalidRanges
      * @expectedException \Respect\Validation\Exceptions\ComponentException
      */
-    public function testInvalidRangeShouldRaiseException($range)
+    public function testInvalidRangeShouldRaiseException($range): void
     {
         $o = new Ip($range);
     }
diff --git a/tests/unit/Rules/IterableTypeTest.php b/tests/unit/Rules/IterableTypeTest.php
index 59cbbbbc..218157d6 100644
--- a/tests/unit/Rules/IterableTypeTest.php
+++ b/tests/unit/Rules/IterableTypeTest.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 /**
diff --git a/tests/unit/Rules/JsonTest.php b/tests/unit/Rules/JsonTest.php
index dcd5fd96..3193225e 100644
--- a/tests/unit/Rules/JsonTest.php
+++ b/tests/unit/Rules/JsonTest.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 /**
diff --git a/tests/unit/Rules/KeyNestedTest.php b/tests/unit/Rules/KeyNestedTest.php
index bd201c38..bccdf21f 100644
--- a/tests/unit/Rules/KeyNestedTest.php
+++ b/tests/unit/Rules/KeyNestedTest.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 use ArrayObject;
@@ -21,7 +23,7 @@ use PHPUnit\Framework\TestCase;
  */
 class KeyNestedTest extends TestCase
 {
-    public function testArrayWithPresentKeysWillReturnTrueForFullPathValidator()
+    public function testArrayWithPresentKeysWillReturnTrueForFullPathValidator(): void
     {
         $array = [
             'bar' => [
@@ -39,7 +41,7 @@ class KeyNestedTest extends TestCase
         self::assertTrue($rule->validate($array));
     }
 
-    public function testArrayWithNumericKeysWillReturnTrueForFullPathValidator()
+    public function testArrayWithNumericKeysWillReturnTrueForFullPathValidator(): void
     {
         $array = [
             0 => 'Zero, the hero!',
@@ -50,7 +52,7 @@ class KeyNestedTest extends TestCase
         self::assertTrue($rule->check($array));
     }
 
-    public function testArrayWithPresentKeysWillReturnTrueForHalfPathValidator()
+    public function testArrayWithPresentKeysWillReturnTrueForHalfPathValidator(): void
     {
         $array = [
             'bar' => [
@@ -68,7 +70,7 @@ class KeyNestedTest extends TestCase
         self::assertTrue($rule->validate($array));
     }
 
-    public function testObjectWithPresentPropertiesWillReturnTrueForDirtyPathValidator()
+    public function testObjectWithPresentPropertiesWillReturnTrueForDirtyPathValidator(): void
     {
         $object = (object) [
             'bar' => (object) [
@@ -86,7 +88,7 @@ class KeyNestedTest extends TestCase
         self::assertTrue($rule->validate($object));
     }
 
-    public function testEmptyInputMustReturnFalse()
+    public function testEmptyInputMustReturnFalse(): void
     {
         $rule = new KeyNested('bar.foo.baz');
 
@@ -96,7 +98,7 @@ class KeyNestedTest extends TestCase
     /**
      * @expectedException \Respect\Validation\Exceptions\KeyNestedException
      */
-    public function testEmptyInputMustNotAssert()
+    public function testEmptyInputMustNotAssert(): void
     {
         $rule = new KeyNested('bar.foo.baz');
         $rule->assert('');
@@ -105,13 +107,13 @@ class KeyNestedTest extends TestCase
     /**
      * @expectedException \Respect\Validation\Exceptions\KeyNestedException
      */
-    public function testEmptyInputMustNotCheck()
+    public function testEmptyInputMustNotCheck(): void
     {
         $rule = new KeyNested('bar.foo.baz');
         $rule->check('');
     }
 
-    public function testArrayWithEmptyKeyShouldReturnTrue()
+    public function testArrayWithEmptyKeyShouldReturnTrue(): void
     {
         $rule = new KeyNested('emptyKey');
         $input = ['emptyKey' => ''];
@@ -122,7 +124,7 @@ class KeyNestedTest extends TestCase
     /**
      * @expectedException \Respect\Validation\Exceptions\KeyNestedException
      */
-    public function testArrayWithAbsentKeyShouldThrowNestedKeyException()
+    public function testArrayWithAbsentKeyShouldThrowNestedKeyException(): void
     {
         $validator = new KeyNested('bar.bar');
         $object = [
@@ -136,14 +138,14 @@ class KeyNestedTest extends TestCase
     /**
      * @expectedException \Respect\Validation\Exceptions\KeyNestedException
      */
-    public function testNotArrayShouldThrowKeyException()
+    public function testNotArrayShouldThrowKeyException(): void
     {
         $validator = new KeyNested('baz.bar');
         $object = 123;
         self::assertFalse($validator->assert($object));
     }
 
-    public function testExtraValidatorShouldValidateKey()
+    public function testExtraValidatorShouldValidateKey(): void
     {
         $subValidator = new Length(3, 7);
         $validator = new KeyNested('bar.foo.baz', $subValidator);
@@ -157,7 +159,7 @@ class KeyNestedTest extends TestCase
         self::assertTrue($validator->assert($object));
     }
 
-    public function testNotMandatoryExtraValidatorShouldPassWithAbsentKey()
+    public function testNotMandatoryExtraValidatorShouldPassWithAbsentKey(): void
     {
         $subValidator = new Length(1, 3);
         $validator = new KeyNested('bar.rab', $subValidator, false);
@@ -165,7 +167,7 @@ class KeyNestedTest extends TestCase
         self::assertTrue($validator->validate($object));
     }
 
-    public function testArrayAccessWithPresentKeysWillReturnTrue()
+    public function testArrayAccessWithPresentKeysWillReturnTrue(): void
     {
         $arrayAccess = new ArrayObject([
             'bar' => [
diff --git a/tests/unit/Rules/KeySetTest.php b/tests/unit/Rules/KeySetTest.php
index 4469d50f..b56e8fdb 100644
--- a/tests/unit/Rules/KeySetTest.php
+++ b/tests/unit/Rules/KeySetTest.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 use PHPUnit\Framework\TestCase;
@@ -20,7 +22,7 @@ use PHPUnit\Framework\TestCase;
  */
 class KeySetTest extends TestCase
 {
-    public function testShouldAcceptKeyRule()
+    public function testShouldAcceptKeyRule(): void
     {
         $key = new Key('foo', new AlwaysValid(), false);
         $keySet = new KeySet($key);
@@ -30,7 +32,7 @@ class KeySetTest extends TestCase
         self::assertSame(current($rules), $key);
     }
 
-    public function testShouldAcceptAllOfWithOneKeyRule()
+    public function testShouldAcceptAllOfWithOneKeyRule(): void
     {
         $key = new Key('foo', new AlwaysValid(), false);
         $allOf = new AllOf($key);
@@ -45,7 +47,7 @@ class KeySetTest extends TestCase
      * @expectedException \Respect\Validation\Exceptions\ComponentException
      * @expectedExceptionMessage AllOf rule must have only one Key rule
      */
-    public function testShouldNotAcceptAllOfWithMoreThanOneKeyRule()
+    public function testShouldNotAcceptAllOfWithMoreThanOneKeyRule(): void
     {
         $key1 = new Key('foo', new AlwaysValid(), false);
         $key2 = new Key('bar', new AlwaysValid(), false);
@@ -58,7 +60,7 @@ class KeySetTest extends TestCase
      * @expectedException \Respect\Validation\Exceptions\ComponentException
      * @expectedExceptionMessage KeySet rule accepts only Key rules
      */
-    public function testShouldNotAcceptAllOfWithANonKeyRule()
+    public function testShouldNotAcceptAllOfWithANonKeyRule(): void
     {
         $alwaysValid = new AlwaysValid();
         $allOf = new AllOf($alwaysValid);
@@ -70,14 +72,14 @@ class KeySetTest extends TestCase
      * @expectedException \Respect\Validation\Exceptions\ComponentException
      * @expectedExceptionMessage KeySet rule accepts only Key rules
      */
-    public function testShouldNotAcceptANonKeyRule()
+    public function testShouldNotAcceptANonKeyRule(): void
     {
         $alwaysValid = new AlwaysValid();
 
         new KeySet($alwaysValid);
     }
 
-    public function testShouldReturnKeys()
+    public function testShouldReturnKeys(): void
     {
         $key1 = new Key('foo', new AlwaysValid(), true);
         $key2 = new Key('bar', new AlwaysValid(), false);
@@ -87,7 +89,7 @@ class KeySetTest extends TestCase
         self::assertEquals(['foo', 'bar'], $keySet->getKeys());
     }
 
-    public function testShouldValidateKeysWhenThereAreMissingRequiredKeys()
+    public function testShouldValidateKeysWhenThereAreMissingRequiredKeys(): void
     {
         $input = [
             'foo' => 42,
@@ -101,7 +103,7 @@ class KeySetTest extends TestCase
         self::assertFalse($keySet->validate($input));
     }
 
-    public function testShouldValidateKeysWhenThereAreMissingNonRequiredKeys()
+    public function testShouldValidateKeysWhenThereAreMissingNonRequiredKeys(): void
     {
         $input = [
             'foo' => 42,
@@ -115,7 +117,7 @@ class KeySetTest extends TestCase
         self::assertTrue($keySet->validate($input));
     }
 
-    public function testShouldValidateKeysWhenThereAreMoreKeys()
+    public function testShouldValidateKeysWhenThereAreMoreKeys(): void
     {
         $input = [
             'foo' => 42,
@@ -131,7 +133,7 @@ class KeySetTest extends TestCase
         self::assertFalse($keySet->validate($input));
     }
 
-    public function testShouldValidateKeysWhenEmpty()
+    public function testShouldValidateKeysWhenEmpty(): void
     {
         $input = [];
 
@@ -147,7 +149,7 @@ class KeySetTest extends TestCase
      * @expectedException \Respect\Validation\Exceptions\KeySetException
      * @expectedExceptionMessage Must have keys { "foo", "bar" }
      */
-    public function testShouldCheckKeys()
+    public function testShouldCheckKeys(): void
     {
         $input = [];
 
@@ -162,7 +164,7 @@ class KeySetTest extends TestCase
      * @expectedException \Respect\Validation\Exceptions\KeySetException
      * @expectedExceptionMessage Must have keys { "foo", "bar" }
      */
-    public function testShouldAssertKeys()
+    public function testShouldAssertKeys(): void
     {
         $input = [];
 
@@ -178,7 +180,7 @@ class KeySetTest extends TestCase
      * @expectedExceptionMessage Must have keys { "name" }
      * @dataProvider providerForInvalidArguments
      */
-    public function testShouldThrowExceptionInCaseArgumentIsAnythingOtherThanArray($input)
+    public function testShouldThrowExceptionInCaseArgumentIsAnythingOtherThanArray($input): void
     {
         $keySet = new KeySet(new Key('name'));
         $keySet->assert($input);
diff --git a/tests/unit/Rules/KeyTest.php b/tests/unit/Rules/KeyTest.php
index f0ab10ba..c62e1898 100644
--- a/tests/unit/Rules/KeyTest.php
+++ b/tests/unit/Rules/KeyTest.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 use PHPUnit\Framework\TestCase;
@@ -20,7 +22,7 @@ use PHPUnit\Framework\TestCase;
  */
 class KeyTest extends TestCase
 {
-    public function testArrayWithPresentKeyShouldReturnTrue()
+    public function testArrayWithPresentKeyShouldReturnTrue(): void
     {
         $validator = new Key('bar');
         $someArray = [];
@@ -28,7 +30,7 @@ class KeyTest extends TestCase
         self::assertTrue($validator->validate($someArray));
     }
 
-    public function testArrayWithNumericKeyShouldReturnTrue()
+    public function testArrayWithNumericKeyShouldReturnTrue(): void
     {
         $validator = new Key(0);
         $someArray = [];
@@ -36,7 +38,7 @@ class KeyTest extends TestCase
         self::assertTrue($validator->validate($someArray));
     }
 
-    public function testEmptyInputMustReturnFalse()
+    public function testEmptyInputMustReturnFalse(): void
     {
         $validator = new Key('someEmptyKey');
         $input = '';
@@ -47,7 +49,7 @@ class KeyTest extends TestCase
     /**
      * @expectedException \Respect\Validation\Exceptions\KeyException
      */
-    public function testEmptyInputMustNotAssert()
+    public function testEmptyInputMustNotAssert(): void
     {
         $validator = new Key('someEmptyKey');
         $validator->assert('');
@@ -56,13 +58,13 @@ class KeyTest extends TestCase
     /**
      * @expectedException \Respect\Validation\Exceptions\KeyException
      */
-    public function testEmptyInputMustNotCheck()
+    public function testEmptyInputMustNotCheck(): void
     {
         $validator = new Key('someEmptyKey');
         $validator->check('');
     }
 
-    public function testArrayWithEmptyKeyShouldReturnTrue()
+    public function testArrayWithEmptyKeyShouldReturnTrue(): void
     {
         $validator = new Key('someEmptyKey');
         $input = [];
@@ -71,7 +73,7 @@ class KeyTest extends TestCase
         self::assertTrue($validator->validate($input));
     }
 
-    public function testShouldHaveTheSameReturnValueForAllValidators()
+    public function testShouldHaveTheSameReturnValueForAllValidators(): void
     {
         $rule = new Key('key', new NotEmpty());
         $input = ['key' => ''];
@@ -94,17 +96,18 @@ class KeyTest extends TestCase
     /**
      * @expectedException \Respect\Validation\Exceptions\KeyException
      */
-    public function testArrayWithAbsentKeyShouldThrowKeyException()
+    public function testArrayWithAbsentKeyShouldThrowKeyException(): void
     {
         $validator = new Key('bar');
         $someArray = [];
         $someArray['baraaaaaa'] = 'foo';
         self::assertTrue($validator->assert($someArray));
     }
+
     /**
      * @expectedException \Respect\Validation\Exceptions\KeyException
      */
-    public function testNotArrayShouldThrowKeyException()
+    public function testNotArrayShouldThrowKeyException(): void
     {
         $validator = new Key('bar');
         $someArray = 123;
@@ -114,12 +117,12 @@ class KeyTest extends TestCase
     /**
      * @expectedException \Respect\Validation\Exceptions\ComponentException
      */
-    public function testInvalidConstructorParametersShouldThrowComponentExceptionUponInstantiation()
+    public function testInvalidConstructorParametersShouldThrowComponentExceptionUponInstantiation(): void
     {
         $validator = new Key(['invalid']);
     }
 
-    public function testExtraValidatorShouldValidateKey()
+    public function testExtraValidatorShouldValidateKey(): void
     {
         $subValidator = new Length(1, 3);
         $validator = new Key('bar', $subValidator);
@@ -128,7 +131,7 @@ class KeyTest extends TestCase
         self::assertTrue($validator->assert($someArray));
     }
 
-    public function testNotMandatoryExtraValidatorShouldPassWithAbsentKey()
+    public function testNotMandatoryExtraValidatorShouldPassWithAbsentKey(): void
     {
         $subValidator = new Length(1, 3);
         $validator = new Key('bar', $subValidator, false);
diff --git a/tests/unit/Rules/KeyValueTest.php b/tests/unit/Rules/KeyValueTest.php
index 8870fcf4..3403fcbe 100644
--- a/tests/unit/Rules/KeyValueTest.php
+++ b/tests/unit/Rules/KeyValueTest.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 use PHPUnit\Framework\TestCase;
@@ -20,7 +22,7 @@ use PHPUnit\Framework\TestCase;
  */
 class KeyValueTest extends TestCase
 {
-    public function testShouldDefineValuesOnConstructor()
+    public function testShouldDefineValuesOnConstructor(): void
     {
         $comparedKey = 'foo';
         $ruleName = 'equals';
@@ -33,42 +35,42 @@ class KeyValueTest extends TestCase
         self::assertSame($baseKey, $rule->baseKey);
     }
 
-    public function testShouldNotValidateWhenComparedKeyDoesNotExist()
+    public function testShouldNotValidateWhenComparedKeyDoesNotExist(): void
     {
         $rule = new KeyValue('foo', 'equals', 'bar');
 
         self::assertFalse($rule->validate(['bar' => 42]));
     }
 
-    public function testShouldNotValidateWhenBaseKeyDoesNotExist()
+    public function testShouldNotValidateWhenBaseKeyDoesNotExist(): void
     {
         $rule = new KeyValue('foo', 'equals', 'bar');
 
         self::assertFalse($rule->validate(['foo' => true]));
     }
 
-    public function testShouldNotValidateRuleIsNotValid()
+    public function testShouldNotValidateRuleIsNotValid(): void
     {
         $rule = new KeyValue('foo', 'probably_not_a_rule', 'bar');
 
         self::assertFalse($rule->validate(['foo' => true, 'bar' => false]));
     }
 
-    public function testShouldValidateWhenDefinedValuesMatch()
+    public function testShouldValidateWhenDefinedValuesMatch(): void
     {
         $rule = new KeyValue('foo', 'equals', 'bar');
 
         self::assertTrue($rule->validate(['foo' => 42, 'bar' => 42]));
     }
 
-    public function testShouldValidateWhenDefinedValuesDoesNotMatch()
+    public function testShouldValidateWhenDefinedValuesDoesNotMatch(): void
     {
         $rule = new KeyValue('foo', 'equals', 'bar');
 
         self::assertFalse($rule->validate(['foo' => 43, 'bar' => 42]));
     }
 
-    public function testShouldAssertWhenDefinedValuesMatch()
+    public function testShouldAssertWhenDefinedValuesMatch(): void
     {
         $rule = new KeyValue('foo', 'equals', 'bar');
 
@@ -79,7 +81,7 @@ class KeyValueTest extends TestCase
      * @expectedException \Respect\Validation\Exceptions\AllOfException
      * @expectedExceptionMessage All of the required rules must pass for foo
      */
-    public function testShouldAssertWhenDefinedValuesDoesNotMatch()
+    public function testShouldAssertWhenDefinedValuesDoesNotMatch(): void
     {
         $rule = new KeyValue('foo', 'equals', 'bar');
         $rule->assert(['foo' => 43, 'bar' => 42]);
@@ -89,13 +91,13 @@ class KeyValueTest extends TestCase
      * @expectedException \Respect\Validation\Exceptions\KeyValueException
      * @expectedExceptionMessage "bar" must be valid to validate "foo"
      */
-    public function testShouldNotAssertWhenRuleIsNotValid()
+    public function testShouldNotAssertWhenRuleIsNotValid(): void
     {
         $rule = new KeyValue('foo', 'probably_not_a_rule', 'bar');
         $rule->assert(['foo' => 43, 'bar' => 42]);
     }
 
-    public function testShouldCheckWhenDefinedValuesMatch()
+    public function testShouldCheckWhenDefinedValuesMatch(): void
     {
         $rule = new KeyValue('foo', 'equals', 'bar');
 
@@ -103,10 +105,10 @@ class KeyValueTest extends TestCase
     }
 
     /**
-     * @expectedException Respect\Validation\Exceptions\EqualsException
+     * @expectedException \Respect\Validation\Exceptions\EqualsException
      * @expectedExceptionMessage foo must equal "bar"
      */
-    public function testShouldCheckWhenDefinedValuesDoesNotMatch()
+    public function testShouldCheckWhenDefinedValuesDoesNotMatch(): void
     {
         $rule = new KeyValue('foo', 'equals', 'bar');
         $rule->check(['foo' => 43, 'bar' => 42]);
diff --git a/tests/unit/Rules/LanguageCodeTest.php b/tests/unit/Rules/LanguageCodeTest.php
index 050a193a..07645697 100644
--- a/tests/unit/Rules/LanguageCodeTest.php
+++ b/tests/unit/Rules/LanguageCodeTest.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 /**
diff --git a/tests/unit/Rules/LeapDateTest.php b/tests/unit/Rules/LeapDateTest.php
index 93e2b07e..87845f9c 100644
--- a/tests/unit/Rules/LeapDateTest.php
+++ b/tests/unit/Rules/LeapDateTest.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 use DateTime;
@@ -23,33 +25,34 @@ class LeapDateTest extends TestCase
 {
     protected $leapDateValidator;
 
-    protected function setUp()
+    protected function setUp(): void
     {
         $this->leapDateValidator = new LeapDate('Y-m-d');
     }
 
-    public function testValidLeapDate_with_string()
+    public function testValidLeapDate_with_string(): void
     {
         self::assertTrue($this->leapDateValidator->validate('1988-02-29'));
     }
 
-    public function testValidLeapDate_with_date_time()
+    public function testValidLeapDate_with_date_time(): void
     {
         self::assertTrue($this->leapDateValidator->validate(
             new DateTime('1988-02-29')));
     }
 
-    public function testInvalidLeapDate_with_string()
+    public function testInvalidLeapDate_with_string(): void
     {
         self::assertFalse($this->leapDateValidator->validate('1989-02-29'));
     }
 
-    public function testInvalidLeapDate_with_date_time()
+    public function testInvalidLeapDate_with_date_time(): void
     {
         self::assertFalse($this->leapDateValidator->validate(
             new DateTime('1989-02-29')));
     }
-    public function testInvalidLeapDate_input()
+
+    public function testInvalidLeapDate_input(): void
     {
         self::assertFalse($this->leapDateValidator->validate([]));
     }
diff --git a/tests/unit/Rules/LeapYearTest.php b/tests/unit/Rules/LeapYearTest.php
index b3b72977..f24b9020 100644
--- a/tests/unit/Rules/LeapYearTest.php
+++ b/tests/unit/Rules/LeapYearTest.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 use DateTime;
@@ -23,12 +25,12 @@ class LeapYearTest extends TestCase
 {
     protected $leapYearValidator;
 
-    protected function setUp()
+    protected function setUp(): void
     {
         $this->leapYearValidator = new LeapYear();
     }
 
-    public function testValidLeapDate()
+    public function testValidLeapDate(): void
     {
         self::assertTrue($this->leapYearValidator->__invoke('2008'));
         self::assertTrue($this->leapYearValidator->__invoke('2008-02-29'));
@@ -37,7 +39,7 @@ class LeapYearTest extends TestCase
             new DateTime('2008-02-29')));
     }
 
-    public function testInvalidLeapDate()
+    public function testInvalidLeapDate(): void
     {
         self::assertFalse($this->leapYearValidator->__invoke(''));
         self::assertFalse($this->leapYearValidator->__invoke('2009'));
diff --git a/tests/unit/Rules/LengthTest.php b/tests/unit/Rules/LengthTest.php
index 3843bdc3..a43d49aa 100644
--- a/tests/unit/Rules/LengthTest.php
+++ b/tests/unit/Rules/LengthTest.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 use PHPUnit\Framework\TestCase;
@@ -23,7 +25,7 @@ class LengthTest extends TestCase
     /**
      * @dataProvider providerForValidLengthInclusive
      */
-    public function testLengthInsideBoundsForInclusiveCasesReturnTrue($string, $min, $max)
+    public function testLengthInsideBoundsForInclusiveCasesReturnTrue($string, $min, $max): void
     {
         $validator = new Length($min, $max, true);
         self::assertTrue($validator->validate($string));
@@ -32,7 +34,7 @@ class LengthTest extends TestCase
     /**
      * @dataProvider providerForValidLengthNonInclusive
      */
-    public function testLengthInsideBoundsForNonInclusiveCasesShouldReturnTrue($string, $min, $max)
+    public function testLengthInsideBoundsForNonInclusiveCasesShouldReturnTrue($string, $min, $max): void
     {
         $validator = new Length($min, $max, false);
         self::assertTrue($validator->validate($string));
@@ -41,7 +43,7 @@ class LengthTest extends TestCase
     /**
      * @dataProvider providerForInvalidLengthInclusive
      */
-    public function testLengthOutsideBoundsForInclusiveCasesReturnFalse($string, $min, $max)
+    public function testLengthOutsideBoundsForInclusiveCasesReturnFalse($string, $min, $max): void
     {
         $validator = new Length($min, $max, true);
         self::assertfalse($validator->validate($string));
@@ -50,7 +52,7 @@ class LengthTest extends TestCase
     /**
      * @dataProvider providerForInvalidLengthNonInclusive
      */
-    public function testLengthOutsideBoundsForNonInclusiveCasesReturnFalse($string, $min, $max)
+    public function testLengthOutsideBoundsForNonInclusiveCasesReturnFalse($string, $min, $max): void
     {
         $validator = new Length($min, $max, false);
         self::assertfalse($validator->validate($string));
@@ -60,7 +62,7 @@ class LengthTest extends TestCase
      * @dataProvider providerForComponentException
      * @expectedException \Respect\Validation\Exceptions\ComponentException
      */
-    public function testComponentExceptionsForInvalidParameters($min, $max)
+    public function testComponentExceptionsForInvalidParameters($min, $max): void
     {
         $buggyValidator = new Length($min, $max);
     }
diff --git a/tests/unit/Rules/Locale/PlIdentityCardTest.php b/tests/unit/Rules/Locale/PlIdentityCardTest.php
index 8df2510d..b7bdebf2 100644
--- a/tests/unit/Rules/Locale/PlIdentityCardTest.php
+++ b/tests/unit/Rules/Locale/PlIdentityCardTest.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\Locale;
 
 use Respect\Validation\Rules\RuleTestCase;
diff --git a/tests/unit/Rules/Locale/PlVatinTest.php b/tests/unit/Rules/Locale/PlVatinTest.php
index 1fd9b4ac..a3494568 100644
--- a/tests/unit/Rules/Locale/PlVatinTest.php
+++ b/tests/unit/Rules/Locale/PlVatinTest.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules\Locale;
 
 use Respect\Validation\Rules\RuleTestCase;
diff --git a/tests/unit/Rules/LowercaseTest.php b/tests/unit/Rules/LowercaseTest.php
index de285cb6..88816fc3 100644
--- a/tests/unit/Rules/LowercaseTest.php
+++ b/tests/unit/Rules/LowercaseTest.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 use PHPUnit\Framework\TestCase;
@@ -23,7 +25,7 @@ class LowercaseTest extends TestCase
     /**
      * @dataProvider providerForValidLowercase
      */
-    public function testValidLowercaseShouldReturnTrue($input)
+    public function testValidLowercaseShouldReturnTrue($input): void
     {
         $lowercase = new Lowercase();
         self::assertTrue($lowercase->__invoke($input));
@@ -35,7 +37,7 @@ class LowercaseTest extends TestCase
      * @dataProvider providerForInvalidLowercase
      * @expectedException \Respect\Validation\Exceptions\LowercaseException
      */
-    public function testInvalidLowercaseShouldThrowException($input)
+    public function testInvalidLowercaseShouldThrowException($input): void
     {
         $lowercase = new Lowercase();
         self::assertFalse($lowercase->__invoke($input));
diff --git a/tests/unit/Rules/LuhnTest.php b/tests/unit/Rules/LuhnTest.php
index 1ee4b16e..e6f75ed4 100644
--- a/tests/unit/Rules/LuhnTest.php
+++ b/tests/unit/Rules/LuhnTest.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 /**
diff --git a/tests/unit/Rules/MacAddressTest.php b/tests/unit/Rules/MacAddressTest.php
index e2853e8a..861ee6d2 100644
--- a/tests/unit/Rules/MacAddressTest.php
+++ b/tests/unit/Rules/MacAddressTest.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 use PHPUnit\Framework\TestCase;
@@ -22,7 +24,7 @@ class MacAddressTest extends TestCase
 {
     protected $macaddressValidator;
 
-    protected function setUp()
+    protected function setUp(): void
     {
         $this->macaddressValidator = new MacAddress();
     }
@@ -30,7 +32,7 @@ class MacAddressTest extends TestCase
     /**
      * @dataProvider providerForMacAddress
      */
-    public function testValidMacaddressesShouldReturnTrue($input)
+    public function testValidMacaddressesShouldReturnTrue($input): void
     {
         self::assertTrue($this->macaddressValidator->__invoke($input));
         self::assertTrue($this->macaddressValidator->assert($input));
@@ -41,7 +43,7 @@ class MacAddressTest extends TestCase
      * @dataProvider providerForNotMacAddress
      * @expectedException \Respect\Validation\Exceptions\MacAddressException
      */
-    public function testInvalidMacaddressShouldThrowMacAddressException($input)
+    public function testInvalidMacaddressShouldThrowMacAddressException($input): void
     {
         self::assertFalse($this->macaddressValidator->__invoke($input));
         self::assertFalse($this->macaddressValidator->assert($input));
diff --git a/tests/unit/Rules/MaxTest.php b/tests/unit/Rules/MaxTest.php
index edef22e1..f83afe4d 100644
--- a/tests/unit/Rules/MaxTest.php
+++ b/tests/unit/Rules/MaxTest.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 use PHPUnit\Framework\TestCase;
@@ -23,7 +25,7 @@ class MaxTest extends TestCase
     /**
      * @dataProvider providerForValidMax
      */
-    public function testValidMaxInputShouldReturnTrue($maxValue, $inclusive, $input)
+    public function testValidMaxInputShouldReturnTrue($maxValue, $inclusive, $input): void
     {
         $max = new Max($maxValue, $inclusive);
         self::assertTrue($max->validate($input));
@@ -35,7 +37,7 @@ class MaxTest extends TestCase
      * @dataProvider providerForInvalidMax
      * @expectedException \Respect\Validation\Exceptions\MaxException
      */
-    public function testInvalidMaxValueShouldThrowMaxException($maxValue, $inclusive, $input)
+    public function testInvalidMaxValueShouldThrowMaxException($maxValue, $inclusive, $input): void
     {
         $max = new Max($maxValue, $inclusive);
         self::assertFalse($max->validate($input));
diff --git a/tests/unit/Rules/MimetypeTest.php b/tests/unit/Rules/MimetypeTest.php
index fec3bc34..c95b4ad5 100644
--- a/tests/unit/Rules/MimetypeTest.php
+++ b/tests/unit/Rules/MimetypeTest.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 use PHPUnit\Framework\TestCase;
@@ -35,12 +37,12 @@ class MimetypeTest extends TestCase
         file_put_contents($this->filename, 'File content');
     }
 
-    protected function tearDown()
+    protected function tearDown(): void
     {
         unlink($this->filename);
     }
 
-    public function testShouldValidateMimetype()
+    public function testShouldValidateMimetype(): void
     {
         $mimetype = 'plain/text';
 
@@ -61,7 +63,7 @@ class MimetypeTest extends TestCase
         $rule->validate($this->filename);
     }
 
-    public function testShouldValidateSplFileInfoMimetype()
+    public function testShouldValidateSplFileInfoMimetype(): void
     {
         $fileInfo = new SplFileInfo($this->filename);
         $mimetype = 'plain/text';
@@ -83,14 +85,14 @@ class MimetypeTest extends TestCase
         self::assertTrue($rule->validate($fileInfo));
     }
 
-    public function testShouldInvalidateWhenNotStringNorSplFileInfo()
+    public function testShouldInvalidateWhenNotStringNorSplFileInfo(): void
     {
         $rule = new Mimetype('application/octet-stream');
 
         self::assertFalse($rule->validate([__FILE__]));
     }
 
-    public function testShouldInvalidateWhenItIsNotAValidFile()
+    public function testShouldInvalidateWhenItIsNotAValidFile(): void
     {
         $rule = new Mimetype('application/octet-stream');
 
@@ -101,7 +103,7 @@ class MimetypeTest extends TestCase
      * @expectedException \Respect\Validation\Exceptions\MimetypeException
      * @expectedExceptionMessageRegExp #".+MimetypeTest.php" must have "application.?/json" mimetype#
      */
-    public function testShouldThrowMimetypeExceptionWhenCheckingValue()
+    public function testShouldThrowMimetypeExceptionWhenCheckingValue(): void
     {
         $rule = new Mimetype('application/json');
         $rule->check(__FILE__);
diff --git a/tests/unit/Rules/MinTest.php b/tests/unit/Rules/MinTest.php
index 289d6785..85dca6e9 100644
--- a/tests/unit/Rules/MinTest.php
+++ b/tests/unit/Rules/MinTest.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 use DateTime;
@@ -24,7 +26,7 @@ class MinTest extends TestCase
     /**
      * @dataProvider providerForValidMin
      */
-    public function testValidMinShouldReturnTrue($minValue, $inclusive, $input)
+    public function testValidMinShouldReturnTrue($minValue, $inclusive, $input): void
     {
         $min = new Min($minValue, $inclusive);
         self::assertTrue($min->__invoke($input));
@@ -36,7 +38,7 @@ class MinTest extends TestCase
      * @dataProvider providerForInvalidMin
      * @expectedException \Respect\Validation\Exceptions\MinException
      */
-    public function testInvalidMinShouldThrowMinException($minValue, $inclusive, $input)
+    public function testInvalidMinShouldThrowMinException($minValue, $inclusive, $input): void
     {
         $min = new Min($minValue, $inclusive);
         self::assertFalse($min->__invoke($input));
diff --git a/tests/unit/Rules/MininumAgeTest.php b/tests/unit/Rules/MininumAgeTest.php
index c80d33d4..0f8f54d7 100644
--- a/tests/unit/Rules/MininumAgeTest.php
+++ b/tests/unit/Rules/MininumAgeTest.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 use PHPUnit\Framework\TestCase;
@@ -23,7 +25,7 @@ class MininumAgeTest extends TestCase
     /**
      * @dataProvider providerForValidDateValidMinimumAge
      */
-    public function testValidMinimumAgeInsideBoundsShouldPass($age, $format, $input)
+    public function testValidMinimumAgeInsideBoundsShouldPass($age, $format, $input): void
     {
         $minimumAge = new MinimumAge($age, $format);
         self::assertTrue($minimumAge->__invoke($input));
@@ -35,7 +37,7 @@ class MininumAgeTest extends TestCase
      * @dataProvider providerForValidDateInvalidMinimumAge
      * @expectedException \Respect\Validation\Exceptions\MinimumAgeException
      */
-    public function testInvalidMinimumAgeShouldThrowException($age, $format, $input)
+    public function testInvalidMinimumAgeShouldThrowException($age, $format, $input): void
     {
         $minimumAge = new MinimumAge($age, $format);
         self::assertFalse($minimumAge->__invoke($input));
@@ -46,7 +48,7 @@ class MininumAgeTest extends TestCase
      * @dataProvider providerForInvalidDate
      * @expectedException \Respect\Validation\Exceptions\MinimumAgeException
      */
-    public function testInvalidDateShouldNotPass($age, $format, $input)
+    public function testInvalidDateShouldNotPass($age, $format, $input): void
     {
         $minimumAge = new MinimumAge($age, $format);
         self::assertFalse($minimumAge->__invoke($input));
@@ -57,7 +59,7 @@ class MininumAgeTest extends TestCase
      * @expectedException \Respect\Validation\Exceptions\ComponentException
      * @expectedExceptionMessage The age must be a integer value
      */
-    public function testShouldNotAcceptNonIntegerAgeOnConstructor()
+    public function testShouldNotAcceptNonIntegerAgeOnConstructor(): void
     {
         new MinimumAge('L12');
     }
diff --git a/tests/unit/Rules/MultipleTest.php b/tests/unit/Rules/MultipleTest.php
index 6ef20332..6bd834ab 100644
--- a/tests/unit/Rules/MultipleTest.php
+++ b/tests/unit/Rules/MultipleTest.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 use PHPUnit\Framework\TestCase;
@@ -23,7 +25,7 @@ class MultipleTest extends TestCase
     /**
      * @dataProvider providerForMultiple
      */
-    public function testValidNumberMultipleOf($multipleOf, $input)
+    public function testValidNumberMultipleOf($multipleOf, $input): void
     {
         $multiple = new Multiple($multipleOf);
         self::assertTrue($multiple->validate($input));
@@ -35,7 +37,7 @@ class MultipleTest extends TestCase
      * @dataProvider providerForNotMultiple
      * @expectedException \Respect\Validation\Exceptions\MultipleException
      */
-    public function testNotMultipleShouldThrowMultipleException($multipleOf, $input)
+    public function testNotMultipleShouldThrowMultipleException($multipleOf, $input): void
     {
         $multiple = new Multiple($multipleOf);
         self::assertFalse($multiple->validate($input));
diff --git a/tests/unit/Rules/NegativeTest.php b/tests/unit/Rules/NegativeTest.php
index 707bca8b..43b7d92b 100644
--- a/tests/unit/Rules/NegativeTest.php
+++ b/tests/unit/Rules/NegativeTest.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 use PHPUnit\Framework\TestCase;
@@ -22,7 +24,7 @@ class NegativeTest extends TestCase
 {
     protected $negativeValidator;
 
-    protected function setUp()
+    protected function setUp(): void
     {
         $this->negativeValidator = new Negative();
     }
@@ -30,7 +32,7 @@ class NegativeTest extends TestCase
     /**
      * @dataProvider providerForNegative
      */
-    public function testNegativeShouldPass($input)
+    public function testNegativeShouldPass($input): void
     {
         self::assertTrue($this->negativeValidator->assert($input));
         self::assertTrue($this->negativeValidator->__invoke($input));
@@ -41,7 +43,7 @@ class NegativeTest extends TestCase
      * @dataProvider providerForNotNegative
      * @expectedException \Respect\Validation\Exceptions\NegativeException
      */
-    public function testNotNegativeNumbersShouldThrowNegativeException($input)
+    public function testNotNegativeNumbersShouldThrowNegativeException($input): void
     {
         self::assertFalse($this->negativeValidator->__invoke($input));
         self::assertFalse($this->negativeValidator->assert($input));
diff --git a/tests/unit/Rules/NfeAccessKeyTest.php b/tests/unit/Rules/NfeAccessKeyTest.php
index 0da72138..f6f47365 100644
--- a/tests/unit/Rules/NfeAccessKeyTest.php
+++ b/tests/unit/Rules/NfeAccessKeyTest.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 use PHPUnit\Framework\TestCase;
@@ -22,7 +24,7 @@ class NfeAccessKeyTest extends TestCase
 {
     protected $nfeValidator;
 
-    protected function setUp()
+    protected function setUp(): void
     {
         $this->nfeValidator = new NfeAccessKey();
     }
@@ -30,7 +32,7 @@ class NfeAccessKeyTest extends TestCase
     /**
      * @dataProvider validAccessKeyProvider
      */
-    public function testValidAccessKey($aK)
+    public function testValidAccessKey($aK): void
     {
         self::assertTrue($this->nfeValidator->assert($aK));
         self::assertTrue($this->nfeValidator->__invoke($aK));
@@ -41,7 +43,7 @@ class NfeAccessKeyTest extends TestCase
      * @dataProvider invalidAccessKeyProvider
      * @expectedException \Respect\Validation\Exceptions\NfeAccessKeyException
      */
-    public function testInvalidAccessKey($aK)
+    public function testInvalidAccessKey($aK): void
     {
         self::assertFalse($this->nfeValidator->assert($aK));
     }
@@ -50,7 +52,7 @@ class NfeAccessKeyTest extends TestCase
      * @dataProvider invalidAccessKeyLengthProvider
      * @expectedException \Respect\Validation\Exceptions\NfeAccessKeyException
      */
-    public function testInvalidLengthCnh($aK)
+    public function testInvalidLengthCnh($aK): void
     {
         self::assertFalse($this->nfeValidator->assert($aK));
     }
diff --git a/tests/unit/Rules/NifTest.php b/tests/unit/Rules/NifTest.php
index 82bfcb91..5ba34347 100644
--- a/tests/unit/Rules/NifTest.php
+++ b/tests/unit/Rules/NifTest.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 /**
diff --git a/tests/unit/Rules/NoTest.php b/tests/unit/Rules/NoTest.php
index eac7b5b9..31550ff1 100644
--- a/tests/unit/Rules/NoTest.php
+++ b/tests/unit/Rules/NoTest.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 use PHPUnit\Framework\TestCase;
@@ -20,7 +22,7 @@ use PHPUnit\Framework\TestCase;
  */
 class NoTest extends TestCase
 {
-    public function testShouldUseDefaultPattern()
+    public function testShouldUseDefaultPattern(): void
     {
         $rule = new No();
 
@@ -30,7 +32,7 @@ class NoTest extends TestCase
         self::assertEquals($expectedPattern, $actualPattern);
     }
 
-    public function testShouldUseLocalPatternForNoExpressionWhenDefined()
+    public function testShouldUseLocalPatternForNoExpressionWhenDefined(): void
     {
         if (!defined('NOEXPR')) {
             $this->markTestSkipped('Constant NOEXPR is not defined');
@@ -49,7 +51,7 @@ class NoTest extends TestCase
     /**
      * @dataProvider validNoProvider
      */
-    public function testShouldValidatePatternAccordingToTheDefinedLocale($input)
+    public function testShouldValidatePatternAccordingToTheDefinedLocale($input): void
     {
         $rule = new No();
 
@@ -71,7 +73,7 @@ class NoTest extends TestCase
     /**
      * @dataProvider invalidNoProvider
      */
-    public function testShouldNotValidatePatternAccordingToTheDefinedLocale($input)
+    public function testShouldNotValidatePatternAccordingToTheDefinedLocale($input): void
     {
         $rule = new No();
 
diff --git a/tests/unit/Rules/NoWhitespaceTest.php b/tests/unit/Rules/NoWhitespaceTest.php
index 2b5bd372..506bf29c 100644
--- a/tests/unit/Rules/NoWhitespaceTest.php
+++ b/tests/unit/Rules/NoWhitespaceTest.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 use PHPUnit\Framework\TestCase;
@@ -22,7 +24,7 @@ class NoWhitespaceTest extends TestCase
 {
     protected $noWhitespaceValidator;
 
-    protected function setUp()
+    protected function setUp(): void
     {
         $this->noWhitespaceValidator = new NoWhitespace();
     }
@@ -30,7 +32,7 @@ class NoWhitespaceTest extends TestCase
     /**
      * @dataProvider providerForPass
      */
-    public function testStringWithNoWhitespaceShouldPass($input)
+    public function testStringWithNoWhitespaceShouldPass($input): void
     {
         self::assertTrue($this->noWhitespaceValidator->__invoke($input));
         self::assertTrue($this->noWhitespaceValidator->check($input));
@@ -41,15 +43,16 @@ class NoWhitespaceTest extends TestCase
      * @dataProvider providerForFail
      * @expectedException \Respect\Validation\Exceptions\NoWhitespaceException
      */
-    public function testStringWithWhitespaceShouldFail($input)
+    public function testStringWithWhitespaceShouldFail($input): void
     {
         self::assertFalse($this->noWhitespaceValidator->__invoke($input));
         self::assertFalse($this->noWhitespaceValidator->assert($input));
     }
+
     /**
      * @expectedException \Respect\Validation\Exceptions\NoWhitespaceException
      */
-    public function testStringWithLineBreaksShouldFail()
+    public function testStringWithLineBreaksShouldFail(): void
     {
         self::assertFalse($this->noWhitespaceValidator->__invoke("w\npoiur"));
         self::assertFalse($this->noWhitespaceValidator->assert("w\npoiur"));
@@ -81,7 +84,7 @@ class NoWhitespaceTest extends TestCase
      * @issue 346
      * @expectedException \Respect\Validation\Exceptions\NoWhitespaceException
      */
-    public function testArrayDoesNotThrowAWarning()
+    public function testArrayDoesNotThrowAWarning(): void
     {
         $this->noWhitespaceValidator->assert([]);
     }
diff --git a/tests/unit/Rules/NoneOfTest.php b/tests/unit/Rules/NoneOfTest.php
index 0a1f4019..62e7ca05 100644
--- a/tests/unit/Rules/NoneOfTest.php
+++ b/tests/unit/Rules/NoneOfTest.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 use PHPUnit\Framework\TestCase;
@@ -20,7 +22,7 @@ use PHPUnit\Framework\TestCase;
  */
 class NoneOfTest extends TestCase
 {
-    public function testValid()
+    public function testValid(): void
     {
         $valid1 = new Callback(function () {
             return false;
@@ -40,7 +42,7 @@ class NoneOfTest extends TestCase
     /**
      * @expectedException \Respect\Validation\Exceptions\NoneOfException
      */
-    public function testInvalid()
+    public function testInvalid(): void
     {
         $valid1 = new Callback(function () {
             return false;
diff --git a/tests/unit/Rules/NotBlankTest.php b/tests/unit/Rules/NotBlankTest.php
index 85751a96..721b33ee 100644
--- a/tests/unit/Rules/NotBlankTest.php
+++ b/tests/unit/Rules/NotBlankTest.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 use PHPUnit\Framework\TestCase;
@@ -24,7 +26,7 @@ class NotBlankTest extends TestCase
     /**
      * @dataProvider providerForNotBlank
      */
-    public function testShouldValidateWhenNotBlank($input)
+    public function testShouldValidateWhenNotBlank($input): void
     {
         $rule = new NotBlank();
 
@@ -34,7 +36,7 @@ class NotBlankTest extends TestCase
     /**
      * @dataProvider providerForBlank
      */
-    public function testShouldNotValidateWhenBlank($input)
+    public function testShouldNotValidateWhenBlank($input): void
     {
         $rule = new NotBlank();
 
@@ -45,7 +47,7 @@ class NotBlankTest extends TestCase
      * @expectedException \Respect\Validation\Exceptions\NotBlankException
      * @expectedExceptionMessage The value must not be blank
      */
-    public function testShouldThrowExceptionWhenFailure()
+    public function testShouldThrowExceptionWhenFailure(): void
     {
         $rule = new NotBlank();
         $rule->check(0);
@@ -55,7 +57,7 @@ class NotBlankTest extends TestCase
      * @expectedException \Respect\Validation\Exceptions\NotBlankException
      * @expectedExceptionMessage whatever must not be blank
      */
-    public function testShouldThrowExceptionWhenFailureAndDoesHaveAName()
+    public function testShouldThrowExceptionWhenFailureAndDoesHaveAName(): void
     {
         $rule = new NotBlank();
         $rule->setName('whatever');
diff --git a/tests/unit/Rules/NotEmptyTest.php b/tests/unit/Rules/NotEmptyTest.php
index 64a9f3b7..10e35426 100644
--- a/tests/unit/Rules/NotEmptyTest.php
+++ b/tests/unit/Rules/NotEmptyTest.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 use PHPUnit\Framework\TestCase;
@@ -22,7 +24,7 @@ class NotEmptyTest extends TestCase
 {
     protected $object;
 
-    protected function setUp()
+    protected function setUp(): void
     {
         $this->object = new NotEmpty();
     }
@@ -30,7 +32,7 @@ class NotEmptyTest extends TestCase
     /**
      * @dataProvider providerForNotEmpty
      */
-    public function testStringNotEmpty($input)
+    public function testStringNotEmpty($input): void
     {
         self::assertTrue($this->object->assert($input));
     }
@@ -39,7 +41,7 @@ class NotEmptyTest extends TestCase
      * @dataProvider providerForEmpty
      * @expectedException \Respect\Validation\Exceptions\NotEmptyException
      */
-    public function testStringEmpty($input)
+    public function testStringEmpty($input): void
     {
         self::assertFalse($this->object->assert($input));
     }
diff --git a/tests/unit/Rules/NotOptionalTest.php b/tests/unit/Rules/NotOptionalTest.php
index 3739ab1d..2b747658 100644
--- a/tests/unit/Rules/NotOptionalTest.php
+++ b/tests/unit/Rules/NotOptionalTest.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 use PHPUnit\Framework\TestCase;
@@ -23,7 +25,7 @@ class NotOptionalTest extends TestCase
     /**
      * @dataProvider providerForNotOptional
      */
-    public function testShouldValidateWhenNotOptional($input)
+    public function testShouldValidateWhenNotOptional($input): void
     {
         $rule = new NotOptional();
 
@@ -33,7 +35,7 @@ class NotOptionalTest extends TestCase
     /**
      * @dataProvider providerForOptional
      */
-    public function testShouldNotValidateWhenOptional($input)
+    public function testShouldNotValidateWhenOptional($input): void
     {
         $rule = new NotOptional();
 
diff --git a/tests/unit/Rules/NotTest.php b/tests/unit/Rules/NotTest.php
index d6a8b785..afe91e6d 100644
--- a/tests/unit/Rules/NotTest.php
+++ b/tests/unit/Rules/NotTest.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 use PHPUnit\Framework\TestCase;
@@ -24,7 +26,7 @@ class NotTest extends TestCase
     /**
      * @dataProvider providerForValidNot
      */
-    public function testNot($v, $input)
+    public function testNot($v, $input): void
     {
         $not = new Not($v);
         self::assertTrue($not->assert($input));
@@ -34,7 +36,7 @@ class NotTest extends TestCase
      * @dataProvider providerForInvalidNot
      * @expectedException \Respect\Validation\Exceptions\ValidationException
      */
-    public function testNotNotHaha($v, $input)
+    public function testNotNotHaha($v, $input): void
     {
         $not = new Not($v);
         self::assertFalse($not->assert($input));
@@ -43,7 +45,7 @@ class NotTest extends TestCase
     /**
      * @dataProvider providerForSetName
      */
-    public function testNotSetName($v)
+    public function testNotSetName($v): void
     {
         $not = new Not($v);
         $not->setName('Foo');
diff --git a/tests/unit/Rules/NullTypeTest.php b/tests/unit/Rules/NullTypeTest.php
index fc1724e9..9b40854c 100644
--- a/tests/unit/Rules/NullTypeTest.php
+++ b/tests/unit/Rules/NullTypeTest.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 use PHPUnit\Framework\TestCase;
@@ -22,12 +24,12 @@ class NullTypeTest extends TestCase
 {
     protected $object;
 
-    protected function setUp()
+    protected function setUp(): void
     {
         $this->object = new NullType();
     }
 
-    public function testNullValue()
+    public function testNullValue(): void
     {
         self::assertTrue($this->object->assert(null));
         self::assertTrue($this->object->__invoke(null));
@@ -38,7 +40,7 @@ class NullTypeTest extends TestCase
      * @dataProvider providerForNotNull
      * @expectedException \Respect\Validation\Exceptions\NullTypeException
      */
-    public function testNotNull($input)
+    public function testNotNull($input): void
     {
         self::assertFalse($this->object->__invoke($input));
         self::assertFalse($this->object->assert($input));
diff --git a/tests/unit/Rules/NumberTest.php b/tests/unit/Rules/NumberTest.php
index 02a697c6..dd802739 100644
--- a/tests/unit/Rules/NumberTest.php
+++ b/tests/unit/Rules/NumberTest.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 use stdClass;
diff --git a/tests/unit/Rules/NumericValTest.php b/tests/unit/Rules/NumericValTest.php
index 01dd02ac..ffcbf6fb 100644
--- a/tests/unit/Rules/NumericValTest.php
+++ b/tests/unit/Rules/NumericValTest.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 use PHPUnit\Framework\TestCase;
@@ -22,7 +24,7 @@ class NumericValTest extends TestCase
 {
     protected $object;
 
-    protected function setUp()
+    protected function setUp(): void
     {
         $this->object = new NumericVal();
     }
@@ -30,7 +32,7 @@ class NumericValTest extends TestCase
     /**
      * @dataProvider providerForNumeric
      */
-    public function testNumeric($input)
+    public function testNumeric($input): void
     {
         self::assertTrue($this->object->__invoke($input));
         self::assertTrue($this->object->check($input));
@@ -41,7 +43,7 @@ class NumericValTest extends TestCase
      * @dataProvider providerForNotNumeric
      * @expectedException \Respect\Validation\Exceptions\NumericValException
      */
-    public function testNotNumeric($input)
+    public function testNotNumeric($input): void
     {
         self::assertFalse($this->object->__invoke($input));
         self::assertFalse($this->object->assert($input));
diff --git a/tests/unit/Rules/ObjectTypeTest.php b/tests/unit/Rules/ObjectTypeTest.php
index b1cca014..27164311 100644
--- a/tests/unit/Rules/ObjectTypeTest.php
+++ b/tests/unit/Rules/ObjectTypeTest.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 use PHPUnit\Framework\TestCase;
@@ -22,7 +24,7 @@ class ObjectTypeTest extends TestCase
 {
     protected $object;
 
-    protected function setUp()
+    protected function setUp(): void
     {
         $this->object = new ObjectType();
     }
@@ -30,7 +32,7 @@ class ObjectTypeTest extends TestCase
     /**
      * @dataProvider providerForObject
      */
-    public function testObject($input)
+    public function testObject($input): void
     {
         self::assertTrue($this->object->__invoke($input));
         self::assertTrue($this->object->assert($input));
@@ -41,7 +43,7 @@ class ObjectTypeTest extends TestCase
      * @dataProvider providerForNotObject
      * @expectedException \Respect\Validation\Exceptions\ObjectTypeException
      */
-    public function testNotObject($input)
+    public function testNotObject($input): void
     {
         self::assertFalse($this->object->__invoke($input));
         self::assertFalse($this->object->assert($input));
diff --git a/tests/unit/Rules/OddTest.php b/tests/unit/Rules/OddTest.php
index 93f982e9..8b2a34dc 100644
--- a/tests/unit/Rules/OddTest.php
+++ b/tests/unit/Rules/OddTest.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 use PHPUnit\Framework\TestCase;
@@ -22,7 +24,7 @@ class OddTest extends TestCase
 {
     protected $object;
 
-    protected function setUp()
+    protected function setUp(): void
     {
         $this->object = new Odd();
     }
@@ -30,7 +32,7 @@ class OddTest extends TestCase
     /**
      * @dataProvider providerForOdd
      */
-    public function testOdd($input)
+    public function testOdd($input): void
     {
         self::assertTrue($this->object->assert($input));
         self::assertTrue($this->object->__invoke($input));
@@ -41,7 +43,7 @@ class OddTest extends TestCase
      * @dataProvider providerForNotOdd
      * @expectedException \Respect\Validation\Exceptions\OddException
      */
-    public function testNotOdd($input)
+    public function testNotOdd($input): void
     {
         self::assertFalse($this->object->__invoke($input));
         self::assertFalse($this->object->assert($input));
diff --git a/tests/unit/Rules/OneOfTest.php b/tests/unit/Rules/OneOfTest.php
index 13a0411e..fca4acc8 100644
--- a/tests/unit/Rules/OneOfTest.php
+++ b/tests/unit/Rules/OneOfTest.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 use PHPUnit\Framework\TestCase;
@@ -20,7 +22,7 @@ use PHPUnit\Framework\TestCase;
  */
 class OneOfTest extends TestCase
 {
-    public function testValid()
+    public function testValid(): void
     {
         $valid1 = new Callback(function () {
             return false;
@@ -42,7 +44,7 @@ class OneOfTest extends TestCase
     /**
      * @expectedException \Respect\Validation\Exceptions\OneOfException
      */
-    public function testEmptyChain()
+    public function testEmptyChain(): void
     {
         $rule = new OneOf();
 
@@ -53,7 +55,7 @@ class OneOfTest extends TestCase
     /**
      * @expectedException \Respect\Validation\Exceptions\OneOfException
      */
-    public function testInvalid()
+    public function testInvalid(): void
     {
         $valid1 = new Callback(function () {
             return false;
@@ -72,7 +74,7 @@ class OneOfTest extends TestCase
     /**
      * @expectedException \Respect\Validation\Exceptions\OneOfException
      */
-    public function testInvalidMultipleAssert()
+    public function testInvalidMultipleAssert(): void
     {
         $valid1 = new Callback(function () {
             return true;
@@ -92,7 +94,7 @@ class OneOfTest extends TestCase
     /**
      * @expectedException \Respect\Validation\Exceptions\CallbackException
      */
-    public function testInvalidMultipleCheck()
+    public function testInvalidMultipleCheck(): void
     {
         $valid1 = new Callback(function () {
             return true;
@@ -109,10 +111,11 @@ class OneOfTest extends TestCase
 
         $rule->check('any');
     }
+
     /**
      * @expectedException \Respect\Validation\Exceptions\OneOfException
      */
-    public function testInvalidMultipleCheckAllValid()
+    public function testInvalidMultipleCheckAllValid(): void
     {
         $valid1 = new Callback(function () {
             return true;
@@ -133,7 +136,7 @@ class OneOfTest extends TestCase
     /**
      * @expectedException \Respect\Validation\Exceptions\XdigitException
      */
-    public function testInvalidCheck()
+    public function testInvalidCheck(): void
     {
         $rule = new OneOf(new Xdigit(), new Alnum());
         self::assertFalse($rule->validate(-10));
diff --git a/tests/unit/Rules/OptionalTest.php b/tests/unit/Rules/OptionalTest.php
index 8a009900..01589502 100644
--- a/tests/unit/Rules/OptionalTest.php
+++ b/tests/unit/Rules/OptionalTest.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 use PHPUnit\Framework\TestCase;
@@ -50,7 +52,7 @@ class OptionalTest extends TestCase
         ];
     }
 
-    public function testShouldAcceptInstanceOfValidatobleOnConstructor()
+    public function testShouldAcceptInstanceOfValidatobleOnConstructor(): void
     {
         $validatable = $this->createMock(Validatable::class);
         $rule = new Optional($validatable);
@@ -61,7 +63,7 @@ class OptionalTest extends TestCase
     /**
      * @dataProvider providerForOptional
      */
-    public function testShouldNotValidateRuleWhenInputIsOptional($input)
+    public function testShouldNotValidateRuleWhenInputIsOptional($input): void
     {
         $validatable = $this->createMock(Validatable::class);
         $validatable
@@ -76,7 +78,7 @@ class OptionalTest extends TestCase
     /**
      * @dataProvider providerForNotOptional
      */
-    public function testShouldValidateRuleWhenInputIsNotOptional($input)
+    public function testShouldValidateRuleWhenInputIsNotOptional($input): void
     {
         $validatable = $this->createMock(Validatable::class);
         $validatable
@@ -90,7 +92,7 @@ class OptionalTest extends TestCase
         self::assertTrue($rule->validate($input));
     }
 
-    public function testShouldNotAssertRuleWhenInputIsOptional()
+    public function testShouldNotAssertRuleWhenInputIsOptional(): void
     {
         $validatable = $this->createMock(Validatable::class);
         $validatable
@@ -102,7 +104,7 @@ class OptionalTest extends TestCase
         self::assertTrue($rule->assert(''));
     }
 
-    public function testShouldAssertRuleWhenInputIsNotOptional()
+    public function testShouldAssertRuleWhenInputIsNotOptional(): void
     {
         $input = 'foo';
 
@@ -118,7 +120,7 @@ class OptionalTest extends TestCase
         self::assertTrue($rule->assert($input));
     }
 
-    public function testShouldNotCheckRuleWhenInputIsOptional()
+    public function testShouldNotCheckRuleWhenInputIsOptional(): void
     {
         $validatable = $this->createMock(Validatable::class);
         $validatable
@@ -130,7 +132,7 @@ class OptionalTest extends TestCase
         self::assertTrue($rule->check(''));
     }
 
-    public function testShouldCheckRuleWhenInputIsNotOptional()
+    public function testShouldCheckRuleWhenInputIsNotOptional(): void
     {
         $input = 'foo';
 
diff --git a/tests/unit/Rules/PerfectSquareTest.php b/tests/unit/Rules/PerfectSquareTest.php
index 4ae68a1f..8a918fca 100644
--- a/tests/unit/Rules/PerfectSquareTest.php
+++ b/tests/unit/Rules/PerfectSquareTest.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 use PHPUnit\Framework\TestCase;
@@ -22,7 +24,7 @@ class PerfectSquareTest extends TestCase
 {
     protected $object;
 
-    protected function setUp()
+    protected function setUp(): void
     {
         $this->object = new PerfectSquare();
     }
@@ -30,7 +32,7 @@ class PerfectSquareTest extends TestCase
     /**
      * @dataProvider providerForPerfectSquare
      */
-    public function testPerfectSquare($input)
+    public function testPerfectSquare($input): void
     {
         self::assertTrue($this->object->__invoke($input));
         self::assertTrue($this->object->check($input));
@@ -41,7 +43,7 @@ class PerfectSquareTest extends TestCase
      * @dataProvider providerForNotPerfectSquare
      * @expectedException \Respect\Validation\Exceptions\PerfectSquareException
      */
-    public function testNotPerfectSquare($input)
+    public function testNotPerfectSquare($input): void
     {
         self::assertFalse($this->object->__invoke($input));
         self::assertFalse($this->object->assert($input));
diff --git a/tests/unit/Rules/PeselTest.php b/tests/unit/Rules/PeselTest.php
index 2cdbc3fd..8afc1111 100644
--- a/tests/unit/Rules/PeselTest.php
+++ b/tests/unit/Rules/PeselTest.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 /**
diff --git a/tests/unit/Rules/PhoneTest.php b/tests/unit/Rules/PhoneTest.php
index 0a907d65..5f4621ed 100644
--- a/tests/unit/Rules/PhoneTest.php
+++ b/tests/unit/Rules/PhoneTest.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 use PHPUnit\Framework\TestCase;
@@ -22,7 +24,7 @@ class PhoneTest extends TestCase
 {
     protected $phoneValidator;
 
-    protected function setUp()
+    protected function setUp(): void
     {
         $this->phoneValidator = new Phone();
     }
@@ -30,7 +32,7 @@ class PhoneTest extends TestCase
     /**
      * @dataProvider providerForPhone
      */
-    public function testValidPhoneShouldReturnTrue($input)
+    public function testValidPhoneShouldReturnTrue($input): void
     {
         self::assertTrue($this->phoneValidator->__invoke($input));
         self::assertTrue($this->phoneValidator->assert($input));
@@ -41,7 +43,7 @@ class PhoneTest extends TestCase
      * @dataProvider providerForNotPhone
      * @expectedException \Respect\Validation\Exceptions\PhoneException
      */
-    public function testInvalidPhoneShouldThrowPhoneException($input)
+    public function testInvalidPhoneShouldThrowPhoneException($input): void
     {
         self::assertFalse($this->phoneValidator->__invoke($input));
         self::assertFalse($this->phoneValidator->assert($input));
diff --git a/tests/unit/Rules/PhpLabelTest.php b/tests/unit/Rules/PhpLabelTest.php
index 6fd215c2..853dafb0 100644
--- a/tests/unit/Rules/PhpLabelTest.php
+++ b/tests/unit/Rules/PhpLabelTest.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 /**
@@ -49,7 +51,7 @@ class PhpLabelTest extends RuleTestCase
             [$rule, 'f o o'],
             [$rule, '0ne'],
             [$rule, '0_ne'],
-            [$rule, uniqid(mt_rand(0, 9))],
+            [$rule, uniqid((string) random_int(0, 9))],
             [$rule, null],
             [$rule, mt_rand()],
             [$rule, 0],
diff --git a/tests/unit/Rules/PisTest.php b/tests/unit/Rules/PisTest.php
index 7b79a5f4..11a0ca02 100644
--- a/tests/unit/Rules/PisTest.php
+++ b/tests/unit/Rules/PisTest.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 use stdClass;
diff --git a/tests/unit/Rules/PositiveTest.php b/tests/unit/Rules/PositiveTest.php
index 88298834..a02dcb4d 100644
--- a/tests/unit/Rules/PositiveTest.php
+++ b/tests/unit/Rules/PositiveTest.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 use PHPUnit\Framework\TestCase;
@@ -22,7 +24,7 @@ class PositiveTest extends TestCase
 {
     protected $object;
 
-    protected function setUp()
+    protected function setUp(): void
     {
         $this->object = new Positive();
     }
@@ -30,7 +32,7 @@ class PositiveTest extends TestCase
     /**
      * @dataProvider providerForPositive
      */
-    public function testPositive($input)
+    public function testPositive($input): void
     {
         self::assertTrue($this->object->__invoke($input));
         self::assertTrue($this->object->check($input));
@@ -41,7 +43,7 @@ class PositiveTest extends TestCase
      * @dataProvider providerForNotPositive
      * @expectedException \Respect\Validation\Exceptions\PositiveException
      */
-    public function testNotPositive($input)
+    public function testNotPositive($input): void
     {
         self::assertFalse($this->object->__invoke($input));
         self::assertFalse($this->object->assert($input));
diff --git a/tests/unit/Rules/PostalCodeTest.php b/tests/unit/Rules/PostalCodeTest.php
index 92229d18..a0acb7d6 100644
--- a/tests/unit/Rules/PostalCodeTest.php
+++ b/tests/unit/Rules/PostalCodeTest.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 use PHPUnit\Framework\TestCase;
@@ -20,7 +22,7 @@ use PHPUnit\Framework\TestCase;
  */
 class PostalCodeTest extends TestCase
 {
-    public function testShouldUsePatternAccordingToCountryCode()
+    public function testShouldUsePatternAccordingToCountryCode(): void
     {
         $countryCode = 'BR';
 
@@ -32,7 +34,7 @@ class PostalCodeTest extends TestCase
         self::assertEquals($expectedPattern, $actualPattern);
     }
 
-    public function testShouldNotBeCaseSensitiveWhenChoosingPatternAccordingToCountryCode()
+    public function testShouldNotBeCaseSensitiveWhenChoosingPatternAccordingToCountryCode(): void
     {
         $rule1 = new PostalCode('BR');
         $rule2 = new PostalCode('br');
@@ -40,7 +42,7 @@ class PostalCodeTest extends TestCase
         self::assertEquals($rule1->regex, $rule2->regex);
     }
 
-    public function testShouldUseDefaultPatternWhenCountryCodeDoesNotHavePostalCode()
+    public function testShouldUseDefaultPatternWhenCountryCodeDoesNotHavePostalCode(): void
     {
         $rule = new PostalCode('ZW');
 
@@ -50,14 +52,14 @@ class PostalCodeTest extends TestCase
         self::assertEquals($expectedPattern, $actualPattern);
     }
 
-    public function testShouldValidateEmptyStringsWhenUsingDefaultPattern()
+    public function testShouldValidateEmptyStringsWhenUsingDefaultPattern(): void
     {
         $rule = new PostalCode('ZW');
 
         self::assertTrue($rule->validate(''));
     }
 
-    public function testShouldNotValidateNonEmptyStringsWhenUsingDefaultPattern()
+    public function testShouldNotValidateNonEmptyStringsWhenUsingDefaultPattern(): void
     {
         $rule = new PostalCode('ZW');
 
@@ -68,7 +70,7 @@ class PostalCodeTest extends TestCase
      * @expectedException \Respect\Validation\Exceptions\ComponentException
      * @expectedExceptionMessage Cannot validate postal code from "Whatever" country
      */
-    public function testShouldThrowsExceptionWhenCountryCodeIsNotValid()
+    public function testShouldThrowsExceptionWhenCountryCodeIsNotValid(): void
     {
         new PostalCode('Whatever');
     }
@@ -76,7 +78,7 @@ class PostalCodeTest extends TestCase
     /**
      * @dataProvider validPostalCodesProvider
      */
-    public function testShouldValidatePatternAccordingToTheDefinedCountryCode($countryCode, $postalCode)
+    public function testShouldValidatePatternAccordingToTheDefinedCountryCode($countryCode, $postalCode): void
     {
         $rule = new PostalCode($countryCode);
 
@@ -99,7 +101,7 @@ class PostalCodeTest extends TestCase
     /**
      * @dataProvider invalidPostalCodesProvider
      */
-    public function testShouldNotValidatePatternAccordingToTheDefinedCountryCode($countryCode, $postalCode)
+    public function testShouldNotValidatePatternAccordingToTheDefinedCountryCode($countryCode, $postalCode): void
     {
         $rule = new PostalCode($countryCode);
 
@@ -110,7 +112,7 @@ class PostalCodeTest extends TestCase
      * @expectedException \Respect\Validation\Exceptions\PostalCodeException
      * @expectedExceptionMessage "02179-000" must be a valid postal code on "US"
      */
-    public function testShouldThrowsPostalCodeExceptionWhenValidationFails()
+    public function testShouldThrowsPostalCodeExceptionWhenValidationFails(): void
     {
         $rule = new PostalCode('US');
         $rule->check('02179-000');
diff --git a/tests/unit/Rules/PrimeNumberTest.php b/tests/unit/Rules/PrimeNumberTest.php
index 05a1b657..b5ccc5da 100644
--- a/tests/unit/Rules/PrimeNumberTest.php
+++ b/tests/unit/Rules/PrimeNumberTest.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 use PHPUnit\Framework\TestCase;
@@ -22,7 +24,7 @@ class PrimeNumberTest extends TestCase
 {
     protected $object;
 
-    protected function setUp()
+    protected function setUp(): void
     {
         $this->object = new PrimeNumber();
     }
@@ -30,7 +32,7 @@ class PrimeNumberTest extends TestCase
     /**
      * @dataProvider providerForPrimeNumber
      */
-    public function testPrimeNumber($input)
+    public function testPrimeNumber($input): void
     {
         self::assertTrue($this->object->__invoke($input));
         self::assertTrue($this->object->check($input));
@@ -41,7 +43,7 @@ class PrimeNumberTest extends TestCase
      * @dataProvider providerForNotPrimeNumber
      * @expectedException \Respect\Validation\Exceptions\PrimeNumberException
      */
-    public function testNotPrimeNumber($input)
+    public function testNotPrimeNumber($input): void
     {
         self::assertFalse($this->object->__invoke($input));
         self::assertFalse($this->object->assert($input));
diff --git a/tests/unit/Rules/PrntTest.php b/tests/unit/Rules/PrntTest.php
index c46ca247..aa627af4 100644
--- a/tests/unit/Rules/PrntTest.php
+++ b/tests/unit/Rules/PrntTest.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 use PHPUnit\Framework\TestCase;
@@ -23,7 +25,7 @@ class PrntTest extends TestCase
     /**
      * @dataProvider providerForValidPrint
      */
-    public function testValidDataWithPrintCharsShouldReturnTrue($validPrint, $additional = '')
+    public function testValidDataWithPrintCharsShouldReturnTrue($validPrint, $additional = ''): void
     {
         $validator = new Prnt($additional);
         self::assertTrue($validator->validate($validPrint));
@@ -33,7 +35,7 @@ class PrntTest extends TestCase
      * @dataProvider providerForInvalidPrint
      * @expectedException \Respect\Validation\Exceptions\PrntException
      */
-    public function testInvalidPrintShouldFailAndThrowPrntException($invalidPrint, $additional = '')
+    public function testInvalidPrintShouldFailAndThrowPrntException($invalidPrint, $additional = ''): void
     {
         $validator = new Prnt($additional);
         self::assertFalse($validator->validate($invalidPrint));
@@ -44,7 +46,7 @@ class PrntTest extends TestCase
      * @dataProvider providerForInvalidParams
      * @expectedException \Respect\Validation\Exceptions\ComponentException
      */
-    public function testInvalidConstructorParamsShouldThrowComponentExceptionUponInstantiation($additional)
+    public function testInvalidConstructorParamsShouldThrowComponentExceptionUponInstantiation($additional): void
     {
         $validator = new Prnt($additional);
     }
@@ -52,7 +54,7 @@ class PrntTest extends TestCase
     /**
      * @dataProvider providerAdditionalChars
      */
-    public function testAdditionalCharsShouldBeRespected($additional, $query)
+    public function testAdditionalCharsShouldBeRespected($additional, $query): void
     {
         $validator = new Prnt($additional);
         self::assertTrue($validator->validate($query));
diff --git a/tests/unit/Rules/PunctTest.php b/tests/unit/Rules/PunctTest.php
index eae731f9..27fb0322 100644
--- a/tests/unit/Rules/PunctTest.php
+++ b/tests/unit/Rules/PunctTest.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 use PHPUnit\Framework\TestCase;
@@ -23,7 +25,7 @@ class PunctTest extends TestCase
     /**
      * @dataProvider providerForValidPunct
      */
-    public function testValidDataWithPunctShouldReturnTrue($validPunct, $additional = '')
+    public function testValidDataWithPunctShouldReturnTrue($validPunct, $additional = ''): void
     {
         $validator = new Punct($additional);
         self::assertTrue($validator->validate($validPunct));
@@ -33,7 +35,7 @@ class PunctTest extends TestCase
      * @dataProvider providerForInvalidPunct
      * @expectedException \Respect\Validation\Exceptions\PunctException
      */
-    public function testInvalidPunctShouldFailAndThrowPunctException($invalidPunct, $additional = '')
+    public function testInvalidPunctShouldFailAndThrowPunctException($invalidPunct, $additional = ''): void
     {
         $validator = new Punct($additional);
         self::assertFalse($validator->validate($invalidPunct));
@@ -44,7 +46,7 @@ class PunctTest extends TestCase
      * @dataProvider providerForInvalidParams
      * @expectedException \Respect\Validation\Exceptions\ComponentException
      */
-    public function testInvalidConstructorParamsShouldThrowComponentExceptionUponInstantiation($additional)
+    public function testInvalidConstructorParamsShouldThrowComponentExceptionUponInstantiation($additional): void
     {
         $validator = new Punct($additional);
     }
@@ -52,7 +54,7 @@ class PunctTest extends TestCase
     /**
      * @dataProvider providerAdditionalChars
      */
-    public function testAdditionalCharsShouldBeRespected($additional, $query)
+    public function testAdditionalCharsShouldBeRespected($additional, $query): void
     {
         $validator = new Punct($additional);
         self::assertTrue($validator->validate($query));
diff --git a/tests/unit/Rules/ReadableTest.php b/tests/unit/Rules/ReadableTest.php
index 5856eebe..75a85afd 100644
--- a/tests/unit/Rules/ReadableTest.php
+++ b/tests/unit/Rules/ReadableTest.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 use PHPUnit\Framework\TestCase;
@@ -36,7 +38,7 @@ class ReadableTest extends TestCase
     /**
      * @covers \Respect\Validation\Rules\Readable::validate
      */
-    public function testValidReadableFileShouldReturnTrue()
+    public function testValidReadableFileShouldReturnTrue(): void
     {
         $GLOBALS['is_readable'] = true;
 
@@ -48,7 +50,7 @@ class ReadableTest extends TestCase
     /**
      * @covers \Respect\Validation\Rules\Readable::validate
      */
-    public function testInvalidReadableFileShouldReturnFalse()
+    public function testInvalidReadableFileShouldReturnFalse(): void
     {
         $GLOBALS['is_readable'] = false;
 
@@ -60,7 +62,7 @@ class ReadableTest extends TestCase
     /**
      * @covers \Respect\Validation\Rules\Readable::validate
      */
-    public function testShouldValidateObjects()
+    public function testShouldValidateObjects(): void
     {
         $rule = new Readable();
         $object = $this->createMock('SplFileInfo', ['isReadable'], ['somefile.txt']);
diff --git a/tests/unit/Rules/RegexTest.php b/tests/unit/Rules/RegexTest.php
index 03eb41a0..59d084c4 100644
--- a/tests/unit/Rules/RegexTest.php
+++ b/tests/unit/Rules/RegexTest.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 /**
diff --git a/tests/unit/Rules/ResourceTypeTest.php b/tests/unit/Rules/ResourceTypeTest.php
index 5d561c26..385a7980 100644
--- a/tests/unit/Rules/ResourceTypeTest.php
+++ b/tests/unit/Rules/ResourceTypeTest.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 use PHPUnit\Framework\TestCase;
@@ -22,7 +24,7 @@ class ResourceTypeTest extends TestCase
 {
     protected $rule;
 
-    protected function setUp()
+    protected function setUp(): void
     {
         $this->rule = new ResourceType();
     }
@@ -30,7 +32,7 @@ class ResourceTypeTest extends TestCase
     /**
      * @dataProvider providerForResource
      */
-    public function testShouldValidateResourceNumbers($input)
+    public function testShouldValidateResourceNumbers($input): void
     {
         self::assertTrue($this->rule->validate($input));
     }
@@ -38,7 +40,7 @@ class ResourceTypeTest extends TestCase
     /**
      * @dataProvider providerForNonResource
      */
-    public function testShouldNotValidateNonResourceNumbers($input)
+    public function testShouldNotValidateNonResourceNumbers($input): void
     {
         self::assertFalse($this->rule->validate($input));
     }
@@ -47,7 +49,7 @@ class ResourceTypeTest extends TestCase
      * @expectedException \Respect\Validation\Exceptions\ResourceTypeException
      * @expectedExceptionMessage "Something" must be a resource
      */
-    public function testShouldThrowResourceExceptionWhenChecking()
+    public function testShouldThrowResourceExceptionWhenChecking(): void
     {
         $this->rule->check('Something');
     }
@@ -67,7 +69,7 @@ class ResourceTypeTest extends TestCase
             ['String'],
             [123],
             [[]],
-            [function () {
+            [function (): void {
             }],
             [new \stdClass()],
             [null],
diff --git a/tests/unit/Rules/RomanTest.php b/tests/unit/Rules/RomanTest.php
index bddad67a..ad441d8f 100644
--- a/tests/unit/Rules/RomanTest.php
+++ b/tests/unit/Rules/RomanTest.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 use PHPUnit\Framework\TestCase;
@@ -22,7 +24,7 @@ class RomanTest extends TestCase
 {
     protected $romanValidator;
 
-    protected function setUp()
+    protected function setUp(): void
     {
         $this->romanValidator = new Roman();
     }
@@ -30,7 +32,7 @@ class RomanTest extends TestCase
     /**
      * @dataProvider providerForRoman
      */
-    public function testValidRomansShouldReturnTrue($input)
+    public function testValidRomansShouldReturnTrue($input): void
     {
         self::assertTrue($this->romanValidator->__invoke($input));
         self::assertTrue($this->romanValidator->assert($input));
@@ -41,7 +43,7 @@ class RomanTest extends TestCase
      * @dataProvider providerForNotRoman
      * @expectedException \Respect\Validation\Exceptions\RomanException
      */
-    public function testInvalidRomansShouldThrowRomanException($input)
+    public function testInvalidRomansShouldThrowRomanException($input): void
     {
         self::assertFalse($this->romanValidator->__invoke($input));
         self::assertFalse($this->romanValidator->assert($input));
diff --git a/tests/unit/Rules/ScalarValTest.php b/tests/unit/Rules/ScalarValTest.php
index 9e6cc9ab..0afce2bc 100644
--- a/tests/unit/Rules/ScalarValTest.php
+++ b/tests/unit/Rules/ScalarValTest.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 use PHPUnit\Framework\TestCase;
@@ -22,7 +24,7 @@ class ScalarValTest extends TestCase
 {
     protected $rule;
 
-    protected function setUp()
+    protected function setUp(): void
     {
         $this->rule = new ScalarVal();
     }
@@ -30,7 +32,7 @@ class ScalarValTest extends TestCase
     /**
      * @dataProvider providerForScalar
      */
-    public function testShouldValidateScalarNumbers($input)
+    public function testShouldValidateScalarNumbers($input): void
     {
         self::assertTrue($this->rule->validate($input));
     }
@@ -38,7 +40,7 @@ class ScalarValTest extends TestCase
     /**
      * @dataProvider providerForNonScalar
      */
-    public function testShouldNotValidateNonScalarNumbers($input)
+    public function testShouldNotValidateNonScalarNumbers($input): void
     {
         self::assertFalse($this->rule->validate($input));
     }
@@ -47,7 +49,7 @@ class ScalarValTest extends TestCase
      * @expectedException \Respect\Validation\Exceptions\ScalarValException
      * @expectedExceptionMessage null must be a scalar value
      */
-    public function testShouldThrowScalarExceptionWhenChecking()
+    public function testShouldThrowScalarExceptionWhenChecking(): void
     {
         $this->rule->check(null);
     }
@@ -68,7 +70,7 @@ class ScalarValTest extends TestCase
     {
         return [
             [[]],
-            [function () {
+            [function (): void {
             }],
             [new \stdClass()],
             [null],
diff --git a/tests/unit/Rules/SfTest.php b/tests/unit/Rules/SfTest.php
index daabafec..9f1fc74c 100644
--- a/tests/unit/Rules/SfTest.php
+++ b/tests/unit/Rules/SfTest.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 use PHPUnit\Framework\TestCase;
@@ -22,7 +24,7 @@ use Respect\Validation\Validator as v;
  */
 class SfTest extends TestCase
 {
-    public function testValidationWithAnExistingValidationConstraint()
+    public function testValidationWithAnExistingValidationConstraint(): void
     {
         $constraintName = 'Time';
         $validConstraintValue = '04:20:00';
@@ -40,7 +42,7 @@ class SfTest extends TestCase
     /**
      * @depends testValidationWithAnExistingValidationConstraint
      */
-    public function testAssertionWithAnExistingValidationConstraint()
+    public function testAssertionWithAnExistingValidationConstraint(): void
     {
         $constraintName = 'Time';
         $validConstraintValue = '04:20:00';
@@ -78,7 +80,7 @@ EOF;
      * @expectedException \Respect\Validation\Exceptions\ComponentException
      * @expectedExceptionMessage Symfony/Validator constraint "FluxCapacitor" does not exist.
      */
-    public function testValidationWithNonExistingConstraint()
+    public function testValidationWithNonExistingConstraint(): void
     {
         $fantasyConstraintName = 'FluxCapacitor';
         $fantasyValue = '8GW';
diff --git a/tests/unit/Rules/SizeTest.php b/tests/unit/Rules/SizeTest.php
index 9b4ea93d..249e1845 100644
--- a/tests/unit/Rules/SizeTest.php
+++ b/tests/unit/Rules/SizeTest.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 use org\bovigo\vfs\content\LargeFileContent;
@@ -73,7 +75,7 @@ class SizeTest extends TestCase
     /**
      * @dataProvider validSizeProvider
      */
-    public function testShouldConvertUnitonConstructor($size, $bytes)
+    public function testShouldConvertUnitonConstructor($size, $bytes): void
     {
         $rule = new Size($size);
 
@@ -84,7 +86,7 @@ class SizeTest extends TestCase
      * @expectedException \Respect\Validation\Exceptions\ComponentException
      * @expectedExceptionMessage "42jb" is not a recognized file size
      */
-    public function testShouldThrowsAnExceptionWhenSizeIsNotValid()
+    public function testShouldThrowsAnExceptionWhenSizeIsNotValid(): void
     {
         new Size('42jb');
     }
@@ -92,14 +94,14 @@ class SizeTest extends TestCase
     /**
      * @dataProvider validFileProvider
      */
-    public function testShouldValidateFile($filename, $minSize, $maxSize, $expectedValidation)
+    public function testShouldValidateFile($filename, $minSize, $maxSize, $expectedValidation): void
     {
         $rule = new Size($minSize, $maxSize);
 
         self::assertEquals($expectedValidation, $rule->validate($filename));
     }
 
-    public function testShouldValidateSplFileInfo()
+    public function testShouldValidateSplFileInfo(): void
     {
         $root = vfsStream::setup();
         $file1Gb = vfsStream::newFile('1gb.txt')->withContent(LargeFileContent::withGigabytes(1))->at($root);
@@ -114,7 +116,7 @@ class SizeTest extends TestCase
      * @expectedException \Respect\Validation\Exceptions\SizeException
      * @expectedExceptionMessageRegExp #"vfs:.?/.?/root.?/1gb.txt" must be greater than "2pb"#
      */
-    public function testShouldThrowsSizeExceptionWhenAsserting()
+    public function testShouldThrowsSizeExceptionWhenAsserting(): void
     {
         $root = vfsStream::setup();
         $file1Gb = vfsStream::newFile('1gb.txt')->withContent(LargeFileContent::withGigabytes(1))->at($root);
diff --git a/tests/unit/Rules/SlugTest.php b/tests/unit/Rules/SlugTest.php
index ddaa7326..4087276e 100644
--- a/tests/unit/Rules/SlugTest.php
+++ b/tests/unit/Rules/SlugTest.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 use PHPUnit\Framework\TestCase;
@@ -22,7 +24,7 @@ class SlugTest extends TestCase
     /**
      * @dataProvider providerValidSlug
      */
-    public function testValidSlug($input)
+    public function testValidSlug($input): void
     {
         $rule = new Slug();
 
@@ -32,7 +34,7 @@ class SlugTest extends TestCase
     /**
      * @dataProvider providerInvalidSlug
      */
-    public function testInvalidSlug($input)
+    public function testInvalidSlug($input): void
     {
         $rule = new Slug();
 
diff --git a/tests/unit/Rules/SortedTest.php b/tests/unit/Rules/SortedTest.php
index b0d342ea..02ffe170 100644
--- a/tests/unit/Rules/SortedTest.php
+++ b/tests/unit/Rules/SortedTest.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 use PHPUnit\Framework\TestCase;
@@ -20,7 +22,7 @@ use PHPUnit\Framework\TestCase;
  */
 class SortedTest extends TestCase
 {
-    public function testPasses()
+    public function testPasses(): void
     {
         $arr = [1, 2, 3];
         $rule = new Sorted();
@@ -30,7 +32,7 @@ class SortedTest extends TestCase
         self::assertTrue($rule->check($arr));
     }
 
-    public function testPassesWithEqualValues()
+    public function testPassesWithEqualValues(): void
     {
         $arr = [1, 2, 2, 3];
         $rule = new Sorted();
@@ -43,7 +45,7 @@ class SortedTest extends TestCase
     /**
      * @expectedException \Respect\Validation\Exceptions\SortedException
      */
-    public function testNotPasses()
+    public function testNotPasses(): void
     {
         $arr = [1, 2, 4, 3];
         $rule = new Sorted();
@@ -52,7 +54,7 @@ class SortedTest extends TestCase
         self::assertFalse($rule->check($arr));
     }
 
-    public function testPassesDescending()
+    public function testPassesDescending(): void
     {
         $arr = [10, 9, 8];
         $rule = new Sorted(null, false);
@@ -62,7 +64,7 @@ class SortedTest extends TestCase
         self::assertTrue($rule->check($arr));
     }
 
-    public function testPassesDescendingWithEqualValues()
+    public function testPassesDescendingWithEqualValues(): void
     {
         $arr = [10, 9, 9, 8];
         $rule = new Sorted(null, false);
@@ -72,7 +74,7 @@ class SortedTest extends TestCase
         self::assertTrue($rule->check($arr));
     }
 
-    public function testPassesByFunction()
+    public function testPassesByFunction(): void
     {
         $arr = [
             [
@@ -97,7 +99,7 @@ class SortedTest extends TestCase
     /**
      * @expectedException \Respect\Validation\Exceptions\SortedException
      */
-    public function testNotPassesByFunction()
+    public function testNotPassesByFunction(): void
     {
         $arr = [
             [
diff --git a/tests/unit/Rules/SpaceTest.php b/tests/unit/Rules/SpaceTest.php
index dcf6554c..4d65adcb 100644
--- a/tests/unit/Rules/SpaceTest.php
+++ b/tests/unit/Rules/SpaceTest.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 use PHPUnit\Framework\TestCase;
@@ -23,7 +25,7 @@ class SpaceTest extends TestCase
     /**
      * @dataProvider providerForValidSpace
      */
-    public function testValidDataWithSpaceShouldReturnTrue($validSpace, $additional = '')
+    public function testValidDataWithSpaceShouldReturnTrue($validSpace, $additional = ''): void
     {
         $validator = new Space($additional);
         self::assertTrue($validator->validate($validSpace));
@@ -33,7 +35,7 @@ class SpaceTest extends TestCase
      * @dataProvider providerForInvalidSpace
      * @expectedException \Respect\Validation\Exceptions\SpaceException
      */
-    public function testInvalidSpaceShouldFailAndThrowSpaceException($invalidSpace, $additional = '')
+    public function testInvalidSpaceShouldFailAndThrowSpaceException($invalidSpace, $additional = ''): void
     {
         $validator = new Space($additional);
         self::assertFalse($validator->validate($invalidSpace));
@@ -44,7 +46,7 @@ class SpaceTest extends TestCase
      * @dataProvider providerForInvalidParams
      * @expectedException \Respect\Validation\Exceptions\ComponentException
      */
-    public function testInvalidConstructorParamsShouldThrowComponentExceptionUponInstantiation($additional)
+    public function testInvalidConstructorParamsShouldThrowComponentExceptionUponInstantiation($additional): void
     {
         $validator = new Space($additional);
     }
@@ -52,7 +54,7 @@ class SpaceTest extends TestCase
     /**
      * @dataProvider providerAdditionalChars
      */
-    public function testAdditionalCharsShouldBeRespected($additional, $query)
+    public function testAdditionalCharsShouldBeRespected($additional, $query): void
     {
         $validator = new Space($additional);
         self::assertTrue($validator->validate($query));
diff --git a/tests/unit/Rules/StartsWithTest.php b/tests/unit/Rules/StartsWithTest.php
index 31282d91..6b638a2f 100644
--- a/tests/unit/Rules/StartsWithTest.php
+++ b/tests/unit/Rules/StartsWithTest.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 use PHPUnit\Framework\TestCase;
@@ -23,7 +25,7 @@ class StartsWithTest extends TestCase
     /**
      * @dataProvider providerForStartsWith
      */
-    public function testStartsWith($start, $input)
+    public function testStartsWith($start, $input): void
     {
         $v = new StartsWith($start);
         self::assertTrue($v->__invoke($input));
@@ -35,7 +37,7 @@ class StartsWithTest extends TestCase
      * @dataProvider providerForNotStartsWith
      * @expectedException \Respect\Validation\Exceptions\StartsWithException
      */
-    public function testNotStartsWith($start, $input, $caseSensitive = false)
+    public function testNotStartsWith($start, $input, $caseSensitive = false): void
     {
         $v = new StartsWith($start, $caseSensitive);
         self::assertFalse($v->__invoke($input));
diff --git a/tests/unit/Rules/StringTypeTest.php b/tests/unit/Rules/StringTypeTest.php
index a0b5f4cb..4c4f227c 100644
--- a/tests/unit/Rules/StringTypeTest.php
+++ b/tests/unit/Rules/StringTypeTest.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 use PHPUnit\Framework\TestCase;
@@ -23,7 +25,7 @@ class StringTypeTest extends TestCase
     /**
      * @dataProvider providerForString
      */
-    public function testString($input)
+    public function testString($input): void
     {
         $rule = new StringType();
 
@@ -33,7 +35,7 @@ class StringTypeTest extends TestCase
     /**
      * @dataProvider providerForNotString
      */
-    public function testNotString($input)
+    public function testNotString($input): void
     {
         $rule = new StringType();
 
diff --git a/tests/unit/Rules/StringValTest.php b/tests/unit/Rules/StringValTest.php
index a2ea4d75..41382f01 100644
--- a/tests/unit/Rules/StringValTest.php
+++ b/tests/unit/Rules/StringValTest.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 use stdClass;
@@ -40,7 +42,7 @@ class StringValTest extends RuleTestCase
 
         return [
             [$rule, []],
-            [$rule, function () {
+            [$rule, function (): void {
             }],
             [$rule, new stdClass()],
             [$rule, null],
diff --git a/tests/unit/Rules/SubdivisionCodeTest.php b/tests/unit/Rules/SubdivisionCodeTest.php
index a1ab63d5..62155e2a 100644
--- a/tests/unit/Rules/SubdivisionCodeTest.php
+++ b/tests/unit/Rules/SubdivisionCodeTest.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 use PHPUnit\Framework\TestCase;
@@ -23,7 +25,7 @@ class SubdivisionCodeTest extends TestCase
      * @expectedException \Respect\Validation\Exceptions\ComponentException
      * @expectedExceptionMessage "whatever" is not a valid country code in ISO 3166-2
      */
-    public function testShouldThrowsExceptionWhenInvalidFormat()
+    public function testShouldThrowsExceptionWhenInvalidFormat(): void
     {
         new SubdivisionCode('whatever');
     }
@@ -32,12 +34,12 @@ class SubdivisionCodeTest extends TestCase
      * @expectedException \Respect\Validation\Exceptions\ComponentException
      * @expectedExceptionMessage "JK" is not a valid country code in ISO 3166-2
      */
-    public function testShouldNotAcceptWrongNamesOnConstructor()
+    public function testShouldNotAcceptWrongNamesOnConstructor(): void
     {
         new SubdivisionCode('JK');
     }
 
-    public function testShouldDefineASubdivisionCodeFormatOnConstructor()
+    public function testShouldDefineASubdivisionCodeFormatOnConstructor(): void
     {
         $countrySubdivision = new SubdivisionCode('US');
 
@@ -58,7 +60,7 @@ class SubdivisionCodeTest extends TestCase
     /**
      * @dataProvider providerForValidSubdivisionCodeInformation
      */
-    public function testShouldValidateValidSubdivisionCodeInformation($countryCode, $input)
+    public function testShouldValidateValidSubdivisionCodeInformation($countryCode, $input): void
     {
         $countrySubdivision = new SubdivisionCode($countryCode);
 
@@ -77,7 +79,7 @@ class SubdivisionCodeTest extends TestCase
     /**
      * @dataProvider providerForInvalidSubdivisionCodeInformation
      */
-    public function testShouldNotValidateInvalidSubdivisionCodeInformation($countryCode, $input)
+    public function testShouldNotValidateInvalidSubdivisionCodeInformation($countryCode, $input): void
     {
         $countrySubdivision = new SubdivisionCode($countryCode);
 
@@ -88,7 +90,7 @@ class SubdivisionCodeTest extends TestCase
      * @expectedException \Respect\Validation\Exceptions\SubdivisionCode\BrSubdivisionCodeException
      * @expectedExceptionMessage "CA" must be a subdivision code of Brazil
      */
-    public function testShouldThrowsSubdivisionCodeException()
+    public function testShouldThrowsSubdivisionCodeException(): void
     {
         $countrySubdivision = new SubdivisionCode('BR');
         $countrySubdivision->assert('CA');
diff --git a/tests/unit/Rules/SymbolicLinkTest.php b/tests/unit/Rules/SymbolicLinkTest.php
index 9edaca1e..57d730af 100644
--- a/tests/unit/Rules/SymbolicLinkTest.php
+++ b/tests/unit/Rules/SymbolicLinkTest.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 use PHPUnit\Framework\TestCase;
@@ -36,7 +38,7 @@ class SymbolicLinkTest extends TestCase
     /**
      * @covers \Respect\Validation\Rules\SymbolicLink::validate
      */
-    public function testValidSymbolicLinkShouldReturnTrue()
+    public function testValidSymbolicLinkShouldReturnTrue(): void
     {
         $GLOBALS['is_link'] = true;
 
@@ -48,7 +50,7 @@ class SymbolicLinkTest extends TestCase
     /**
      * @covers \Respect\Validation\Rules\SymbolicLink::validate
      */
-    public function testInvalidSymbolicLinkShouldThrowException()
+    public function testInvalidSymbolicLinkShouldThrowException(): void
     {
         $GLOBALS['is_link'] = false;
 
@@ -60,7 +62,7 @@ class SymbolicLinkTest extends TestCase
     /**
      * @covers \Respect\Validation\Rules\SymbolicLink::validate
      */
-    public function testShouldValidateObjects()
+    public function testShouldValidateObjects(): void
     {
         $rule = new SymbolicLink();
         $object = $this->createMock('SplFileInfo', ['isLink'], ['somelink.lnk']);
diff --git a/tests/unit/Rules/TldTest.php b/tests/unit/Rules/TldTest.php
index 6ccd5b09..58959871 100644
--- a/tests/unit/Rules/TldTest.php
+++ b/tests/unit/Rules/TldTest.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 use PHPUnit\Framework\TestCase;
@@ -35,7 +37,7 @@ class TldTest extends TestCase
     /**
      * @dataProvider providerForValidTld
      */
-    public function testShouldValidateInputWhenItIsAValidTld($input)
+    public function testShouldValidateInputWhenItIsAValidTld($input): void
     {
         $rule = new Tld();
 
@@ -55,7 +57,7 @@ class TldTest extends TestCase
     /**
      * @dataProvider providerForInvalidTld
      */
-    public function testShouldInvalidateInputWhenItIsNotAValidTld($input)
+    public function testShouldInvalidateInputWhenItIsNotAValidTld($input): void
     {
         $rule = new Tld();
 
diff --git a/tests/unit/Rules/TrueValTest.php b/tests/unit/Rules/TrueValTest.php
index 812966ab..9be82334 100644
--- a/tests/unit/Rules/TrueValTest.php
+++ b/tests/unit/Rules/TrueValTest.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 use PHPUnit\Framework\TestCase;
@@ -23,7 +25,7 @@ class TrueValTest extends TestCase
     /**
      * @dataProvider validTrueProvider
      */
-    public function testShouldValidatePatternAccordingToTheDefinedLocale($input)
+    public function testShouldValidatePatternAccordingToTheDefinedLocale($input): void
     {
         $rule = new TrueVal();
 
@@ -51,7 +53,7 @@ class TrueValTest extends TestCase
     /**
      * @dataProvider invalidTrueProvider
      */
-    public function testShouldNotValidatePatternAccordingToTheDefinedLocale($input)
+    public function testShouldNotValidatePatternAccordingToTheDefinedLocale($input): void
     {
         $rule = new TrueVal();
 
diff --git a/tests/unit/Rules/TypeTest.php b/tests/unit/Rules/TypeTest.php
index 22060502..0811acfd 100644
--- a/tests/unit/Rules/TypeTest.php
+++ b/tests/unit/Rules/TypeTest.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 use PHPUnit\Framework\TestCase;
@@ -21,7 +23,7 @@ use stdClass;
  */
 class TypeTest extends TestCase
 {
-    public function testShouldDefineTypeOnConstructor()
+    public function testShouldDefineTypeOnConstructor(): void
     {
         $type = 'int';
         $rule = new Type($type);
@@ -29,7 +31,7 @@ class TypeTest extends TestCase
         self::assertSame($type, $rule->type);
     }
 
-    public function testShouldNotBeCaseSensitive()
+    public function testShouldNotBeCaseSensitive(): void
     {
         $rule = new Type('InTeGeR');
 
@@ -40,7 +42,7 @@ class TypeTest extends TestCase
      * @expectedException \Respect\Validation\Exceptions\ComponentException
      * @expectedExceptionMessage "whatever" is not a valid type
      */
-    public function testShouldThrowExceptionWhenTypeIsNotValid()
+    public function testShouldThrowExceptionWhenTypeIsNotValid(): void
     {
         new Type('whatever');
     }
@@ -48,7 +50,7 @@ class TypeTest extends TestCase
     /**
      * @dataProvider providerForValidType
      */
-    public function testShouldValidateValidTypes($type, $input)
+    public function testShouldValidateValidTypes($type, $input): void
     {
         $rule = new Type($type);
 
@@ -58,7 +60,7 @@ class TypeTest extends TestCase
     /**
      * @dataProvider providerForInvalidType
      */
-    public function testShouldNotValidateInvalidTypes($type, $input)
+    public function testShouldNotValidateInvalidTypes($type, $input): void
     {
         $rule = new Type($type);
 
@@ -69,7 +71,7 @@ class TypeTest extends TestCase
      * @expectedException \Respect\Validation\Exceptions\TypeException
      * @expectedExceptionMessage "Something" must be "integer"
      */
-    public function testShouldThrowTypeExceptionWhenCheckingAnInvalidInput()
+    public function testShouldThrowTypeExceptionWhenCheckingAnInvalidInput(): void
     {
         $rule = new Type('integer');
         $rule->check('Something');
@@ -81,7 +83,7 @@ class TypeTest extends TestCase
             ['array', []],
             ['bool', true],
             ['boolean', false],
-            ['callable', function () {
+            ['callable', function (): void {
             }],
             ['double', 0.8],
             ['float', 1.0],
diff --git a/tests/unit/Rules/UniqueTest.php b/tests/unit/Rules/UniqueTest.php
index a2c59765..ef0874b7 100644
--- a/tests/unit/Rules/UniqueTest.php
+++ b/tests/unit/Rules/UniqueTest.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 /**
diff --git a/tests/unit/Rules/UploadedTest.php b/tests/unit/Rules/UploadedTest.php
index c85d49f0..42e73acd 100644
--- a/tests/unit/Rules/UploadedTest.php
+++ b/tests/unit/Rules/UploadedTest.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 use PHPUnit\Framework\TestCase;
@@ -36,7 +38,7 @@ class UploadedTest extends TestCase
     /**
      * @covers \Respect\Validation\Rules\Uploaded::validate
      */
-    public function testValidUploadedFileShouldReturnTrue()
+    public function testValidUploadedFileShouldReturnTrue(): void
     {
         $GLOBALS['is_uploaded_file'] = true;
 
@@ -48,7 +50,7 @@ class UploadedTest extends TestCase
     /**
      * @covers \Respect\Validation\Rules\Uploaded::validate
      */
-    public function testInvalidUploadedFileShouldReturnFalse()
+    public function testInvalidUploadedFileShouldReturnFalse(): void
     {
         $GLOBALS['is_uploaded_file'] = false;
 
@@ -60,7 +62,7 @@ class UploadedTest extends TestCase
     /**
      * @covers \Respect\Validation\Rules\Uploaded::validate
      */
-    public function testShouldValidateObjects()
+    public function testShouldValidateObjects(): void
     {
         $GLOBALS['is_uploaded_file'] = true;
 
diff --git a/tests/unit/Rules/UppercaseTest.php b/tests/unit/Rules/UppercaseTest.php
index bc2f3a0e..da07dcca 100644
--- a/tests/unit/Rules/UppercaseTest.php
+++ b/tests/unit/Rules/UppercaseTest.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 use PHPUnit\Framework\TestCase;
@@ -23,7 +25,7 @@ class UppercaseTest extends TestCase
     /**
      * @dataProvider providerForValidUppercase
      */
-    public function testValidUppercaseShouldReturnTrue($input)
+    public function testValidUppercaseShouldReturnTrue($input): void
     {
         $uppercase = new Uppercase();
         self::assertTrue($uppercase->validate($input));
@@ -35,7 +37,7 @@ class UppercaseTest extends TestCase
      * @dataProvider providerForInvalidUppercase
      * @expectedException \Respect\Validation\Exceptions\UppercaseException
      */
-    public function testInvalidUppercaseShouldThrowException($input)
+    public function testInvalidUppercaseShouldThrowException($input): void
     {
         $lowercase = new Uppercase();
         self::assertFalse($lowercase->validate($input));
diff --git a/tests/unit/Rules/UrlTest.php b/tests/unit/Rules/UrlTest.php
index fd34cb14..8c798e6b 100644
--- a/tests/unit/Rules/UrlTest.php
+++ b/tests/unit/Rules/UrlTest.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 use PHPUnit\Framework\TestCase;
@@ -23,7 +25,7 @@ class UrlTest extends TestCase
     /**
      * @dataProvider providerForValidUrl
      */
-    public function testShouldValidateValidUrls($validUrl)
+    public function testShouldValidateValidUrls($validUrl): void
     {
         $validator = new Url();
 
@@ -33,7 +35,7 @@ class UrlTest extends TestCase
     /**
      * @dataProvider providerForInvalidUrl
      */
-    public function testShouldNotValidateInvalidUrls($invalidUrl)
+    public function testShouldNotValidateInvalidUrls($invalidUrl): void
     {
         $validator = new Url();
 
diff --git a/tests/unit/Rules/UuidTest.php b/tests/unit/Rules/UuidTest.php
index 1a64dcce..3a71461e 100644
--- a/tests/unit/Rules/UuidTest.php
+++ b/tests/unit/Rules/UuidTest.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 /**
diff --git a/tests/unit/Rules/VatinTest.php b/tests/unit/Rules/VatinTest.php
index 3ad3ad2c..958d003c 100644
--- a/tests/unit/Rules/VatinTest.php
+++ b/tests/unit/Rules/VatinTest.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 use PHPUnit\Framework\TestCase;
@@ -20,7 +22,7 @@ use Respect\Validation\Validatable;
  */
 final class VatinTest extends TestCase
 {
-    public function testShouldAcceptCountryCodeOnConstructor()
+    public function testShouldAcceptCountryCodeOnConstructor(): void
     {
         $countryCode = 'PL';
         $rule = new Vatin($countryCode);
@@ -32,7 +34,7 @@ final class VatinTest extends TestCase
      * @expectedException \Respect\Validation\Exceptions\ComponentException
      * @expectedExceptionMessage There is no support for VAT identification number from "BR"
      */
-    public function testShouldThrowAnExceptionWhenCountryCodeIsNotSupported()
+    public function testShouldThrowAnExceptionWhenCountryCodeIsNotSupported(): void
     {
         new Vatin('BR');
     }
diff --git a/tests/unit/Rules/VersionTest.php b/tests/unit/Rules/VersionTest.php
index 7412636c..febd1c4a 100644
--- a/tests/unit/Rules/VersionTest.php
+++ b/tests/unit/Rules/VersionTest.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 use PHPUnit\Framework\TestCase;
@@ -23,7 +25,7 @@ class VersionTest extends TestCase
     /**
      * @dataProvider providerForValidVersion
      */
-    public function testValidVersionShouldReturnTrue($input)
+    public function testValidVersionShouldReturnTrue($input): void
     {
         $rule = new Version();
         self::assertTrue($rule->__invoke($input));
@@ -35,7 +37,7 @@ class VersionTest extends TestCase
      * @dataProvider providerForInvalidVersion
      * @expectedException \Respect\Validation\Exceptions\VersionException
      */
-    public function testInvalidVersionShouldThrowException($input)
+    public function testInvalidVersionShouldThrowException($input): void
     {
         $rule = new Version();
         self::assertFalse($rule->__invoke($input));
diff --git a/tests/unit/Rules/VideoUrlTest.php b/tests/unit/Rules/VideoUrlTest.php
index 01150f92..91e80258 100644
--- a/tests/unit/Rules/VideoUrlTest.php
+++ b/tests/unit/Rules/VideoUrlTest.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 use PHPUnit\Framework\TestCase;
@@ -24,7 +26,7 @@ class VideoUrlTest extends TestCase
      * @expectedException \Respect\Validation\Exceptions\ComponentException
      * @expectedExceptionMessage "teste" is not a recognized video service.
      */
-    public function testShouldThrowsAnExceptionWhenProviderIsNotValid()
+    public function testShouldThrowsAnExceptionWhenProviderIsNotValid(): void
     {
         new VideoUrl('teste');
     }
@@ -65,7 +67,7 @@ class VideoUrlTest extends TestCase
     /**
      * @dataProvider validVideoUrlProvider
      */
-    public function testShouldValidateVideoUrl($service, $input)
+    public function testShouldValidateVideoUrl($service, $input): void
     {
         $rule = new VideoUrl($service);
 
@@ -75,7 +77,7 @@ class VideoUrlTest extends TestCase
     /**
      * @dataProvider invalidVideoUrlProvider
      */
-    public function testShouldInvalidateNonVideoUrl($service, $input)
+    public function testShouldInvalidateNonVideoUrl($service, $input): void
     {
         $rule = new VideoUrl($service);
 
@@ -86,7 +88,7 @@ class VideoUrlTest extends TestCase
      * @expectedException \Respect\Validation\Exceptions\VideoUrlException
      * @expectedExceptionMessage "exemplo.com" must be a valid video URL
      */
-    public function testUseAProperExceptionMessageWhenVideoUrlIsNotValid()
+    public function testUseAProperExceptionMessageWhenVideoUrlIsNotValid(): void
     {
         $rule = new VideoUrl();
         $rule->check('exemplo.com');
@@ -96,7 +98,7 @@ class VideoUrlTest extends TestCase
      * @expectedException \Respect\Validation\Exceptions\VideoUrlException
      * @expectedExceptionMessage "exemplo.com" must be a valid "YouTube" video URL
      */
-    public function testUseAProperExceptionMessageWhenVideoUrlIsNotValidForTheDefinedProvider()
+    public function testUseAProperExceptionMessageWhenVideoUrlIsNotValidForTheDefinedProvider(): void
     {
         $rule = new VideoUrl('YouTube');
         $rule->check('exemplo.com');
diff --git a/tests/unit/Rules/VowelTest.php b/tests/unit/Rules/VowelTest.php
index 972020b0..58cf6190 100644
--- a/tests/unit/Rules/VowelTest.php
+++ b/tests/unit/Rules/VowelTest.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 use PHPUnit\Framework\TestCase;
@@ -23,7 +25,7 @@ class VowelTest extends TestCase
     /**
      * @dataProvider providerForValidVowels
      */
-    public function testValidDataWithVowelsShouldReturnTrue($validVowels, $additional = '')
+    public function testValidDataWithVowelsShouldReturnTrue($validVowels, $additional = ''): void
     {
         $validator = new Vowel($additional);
         self::assertTrue($validator->validate($validVowels));
@@ -33,7 +35,7 @@ class VowelTest extends TestCase
      * @dataProvider providerForInvalidVowels
      * @expectedException \Respect\Validation\Exceptions\VowelException
      */
-    public function testInvalidVowelsShouldFailAndThrowVowelException($invalidVowels, $additional = '')
+    public function testInvalidVowelsShouldFailAndThrowVowelException($invalidVowels, $additional = ''): void
     {
         $validator = new Vowel($additional);
         self::assertFalse($validator->validate($invalidVowels));
@@ -44,7 +46,7 @@ class VowelTest extends TestCase
      * @dataProvider providerForInvalidParams
      * @expectedException \Respect\Validation\Exceptions\ComponentException
      */
-    public function testInvalidConstructorParamsShouldThrowComponentExceptionUponInstantiation($additional)
+    public function testInvalidConstructorParamsShouldThrowComponentExceptionUponInstantiation($additional): void
     {
         $validator = new Vowel($additional);
     }
@@ -52,7 +54,7 @@ class VowelTest extends TestCase
     /**
      * @dataProvider providerAdditionalChars
      */
-    public function testAdditionalCharsShouldBeRespected($additional, $query)
+    public function testAdditionalCharsShouldBeRespected($additional, $query): void
     {
         $validator = new Vowel($additional);
         self::assertTrue($validator->validate($query));
diff --git a/tests/unit/Rules/WhenTest.php b/tests/unit/Rules/WhenTest.php
index d11726dd..672f3bc0 100644
--- a/tests/unit/Rules/WhenTest.php
+++ b/tests/unit/Rules/WhenTest.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 /**
@@ -17,14 +19,14 @@ namespace Respect\Validation\Rules;
  */
 class WhenTest extends RuleTestCase
 {
-    public function testShouldConstructAnObjectWithoutElseRule()
+    public function testShouldConstructAnObjectWithoutElseRule(): void
     {
         $rule = new When($this->getRuleMock(true), $this->getRuleMock(true));
 
         self::assertInstanceOf(AlwaysInvalid::class, $rule->else);
     }
 
-    public function testShouldConstructAnObjectWithElseRule()
+    public function testShouldConstructAnObjectWithElseRule(): void
     {
         $rule = new When($this->getRuleMock(true), $this->getRuleMock(true), $this->getRuleMock(true));
 
@@ -35,7 +37,7 @@ class WhenTest extends RuleTestCase
      * @expectedException \Respect\Validation\Exceptions\ValidationException
      * @expectedExceptionMessage Exception for ThenNotValid:assert() method
      */
-    public function testShouldThrowExceptionForTheThenRuleWhenTheIfRuleIsValidAndTheThenRuleIsNotOnAssertMethod()
+    public function testShouldThrowExceptionForTheThenRuleWhenTheIfRuleIsValidAndTheThenRuleIsNotOnAssertMethod(): void
     {
         $if = $this->getRuleMock(true);
         $then = $this->getRuleMock(false, 'ThenNotValid');
@@ -49,7 +51,7 @@ class WhenTest extends RuleTestCase
      * @expectedException \Respect\Validation\Exceptions\ValidationException
      * @expectedExceptionMessage Exception for ThenNotValid:check() method
      */
-    public function testShouldThrowExceptionForTheThenRuleWhenTheIfRuleIsValidAndTheThenRuleIsNotOnCheckMethod()
+    public function testShouldThrowExceptionForTheThenRuleWhenTheIfRuleIsValidAndTheThenRuleIsNotOnCheckMethod(): void
     {
         $if = $this->getRuleMock(true);
         $then = $this->getRuleMock(false, 'ThenNotValid');
@@ -63,7 +65,7 @@ class WhenTest extends RuleTestCase
      * @expectedException \Respect\Validation\Exceptions\ValidationException
      * @expectedExceptionMessage Exception for ElseNotValid:assert() method
      */
-    public function testShouldThrowExceptionForTheElseRuleWhenTheIfRuleIsNotValidAndTheElseRuleIsNotOnAssertMethod()
+    public function testShouldThrowExceptionForTheElseRuleWhenTheIfRuleIsNotValidAndTheElseRuleIsNotOnAssertMethod(): void
     {
         $if = $this->getRuleMock(false);
         $then = $this->getRuleMock(false);
@@ -77,7 +79,7 @@ class WhenTest extends RuleTestCase
      * @expectedException \Respect\Validation\Exceptions\ValidationException
      * @expectedExceptionMessage Exception for ElseNotValid:check() method
      */
-    public function testShouldThrowExceptionForTheElseRuleWhenTheIfRuleIsNotValidAndTheElseRuleIsNotOnCheckMethod()
+    public function testShouldThrowExceptionForTheElseRuleWhenTheIfRuleIsNotValidAndTheElseRuleIsNotOnCheckMethod(): void
     {
         $if = $this->getRuleMock(false);
         $then = $this->getRuleMock(false);
@@ -123,7 +125,6 @@ class WhenTest extends RuleTestCase
                 new When($this->getRuleMock(true), $this->getRuleMock(true), $this->getRuleMock(false)),
                 false,
             ],
-
         ];
     }
 
diff --git a/tests/unit/Rules/WritableTest.php b/tests/unit/Rules/WritableTest.php
index 84344177..a48ddbe4 100644
--- a/tests/unit/Rules/WritableTest.php
+++ b/tests/unit/Rules/WritableTest.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 use PHPUnit\Framework\TestCase;
@@ -36,7 +38,7 @@ class WritableTest extends TestCase
     /**
      * @covers \Respect\Validation\Rules\Writable::validate
      */
-    public function testValidWritableFileShouldReturnTrue()
+    public function testValidWritableFileShouldReturnTrue(): void
     {
         $GLOBALS['is_writable'] = true;
 
@@ -48,7 +50,7 @@ class WritableTest extends TestCase
     /**
      * @covers \Respect\Validation\Rules\Writable::validate
      */
-    public function testInvalidWritableFileShouldReturnFalse()
+    public function testInvalidWritableFileShouldReturnFalse(): void
     {
         $GLOBALS['is_writable'] = false;
 
@@ -60,7 +62,7 @@ class WritableTest extends TestCase
     /**
      * @covers \Respect\Validation\Rules\Writable::validate
      */
-    public function testShouldValidateObjects()
+    public function testShouldValidateObjects(): void
     {
         $rule = new Writable();
         $object = $this->createMock('SplFileInfo', ['isWritable'], ['somefile.txt']);
diff --git a/tests/unit/Rules/XdigitTest.php b/tests/unit/Rules/XdigitTest.php
index afce31d0..b46bf93c 100644
--- a/tests/unit/Rules/XdigitTest.php
+++ b/tests/unit/Rules/XdigitTest.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 use PHPUnit\Framework\TestCase;
@@ -22,7 +24,7 @@ class XdigitTest extends TestCase
 {
     protected $xdigitsValidator;
 
-    protected function setUp()
+    protected function setUp(): void
     {
         $this->xdigitsValidator = new Xdigit();
     }
@@ -30,7 +32,7 @@ class XdigitTest extends TestCase
     /**
      * @dataProvider providerForXdigit
      */
-    public function testValidateValidHexasdecimalDigits($input)
+    public function testValidateValidHexasdecimalDigits($input): void
     {
         self::assertTrue($this->xdigitsValidator->assert($input));
         self::assertTrue($this->xdigitsValidator->check($input));
@@ -41,7 +43,7 @@ class XdigitTest extends TestCase
      * @dataProvider providerForNotXdigit
      * @expectedException \Respect\Validation\Exceptions\XdigitException
      */
-    public function testInvalidHexadecimalDigitsShouldThrowXdigitException($input)
+    public function testInvalidHexadecimalDigitsShouldThrowXdigitException($input): void
     {
         self::assertFalse($this->xdigitsValidator->validate($input));
         self::assertFalse($this->xdigitsValidator->assert($input));
@@ -50,7 +52,7 @@ class XdigitTest extends TestCase
     /**
      * @dataProvider providerAdditionalChars
      */
-    public function testAdditionalCharsShouldBeRespected($additional, $query)
+    public function testAdditionalCharsShouldBeRespected($additional, $query): void
     {
         $validator = new Xdigit($additional);
         self::assertTrue($validator->validate($query));
diff --git a/tests/unit/Rules/YesTest.php b/tests/unit/Rules/YesTest.php
index 6908311b..c564613d 100644
--- a/tests/unit/Rules/YesTest.php
+++ b/tests/unit/Rules/YesTest.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 use PHPUnit\Framework\TestCase;
@@ -20,7 +22,7 @@ use PHPUnit\Framework\TestCase;
  */
 class YesTest extends TestCase
 {
-    public function testShouldUseDefaultPattern()
+    public function testShouldUseDefaultPattern(): void
     {
         $rule = new Yes();
 
@@ -30,7 +32,7 @@ class YesTest extends TestCase
         self::assertEquals($expectedPattern, $actualPattern);
     }
 
-    public function testShouldUseLocalPatternForYesExpressionWhenDefined()
+    public function testShouldUseLocalPatternForYesExpressionWhenDefined(): void
     {
         if (!defined('YESEXPR')) {
             $this->markTestSkipped('Constant YESEXPR is not defined');
@@ -49,7 +51,7 @@ class YesTest extends TestCase
     /**
      * @dataProvider validYesProvider
      */
-    public function testShouldValidatePatternAccordingToTheDefinedLocale($input)
+    public function testShouldValidatePatternAccordingToTheDefinedLocale($input): void
     {
         $rule = new Yes();
 
@@ -70,7 +72,7 @@ class YesTest extends TestCase
     /**
      * @dataProvider invalidYesProvider
      */
-    public function testShouldNotValidatePatternAccordingToTheDefinedLocale($input)
+    public function testShouldNotValidatePatternAccordingToTheDefinedLocale($input): void
     {
         $rule = new Yes();
 
diff --git a/tests/unit/Rules/ZendTest.php b/tests/unit/Rules/ZendTest.php
index 71ca1337..ad7996f9 100644
--- a/tests/unit/Rules/ZendTest.php
+++ b/tests/unit/Rules/ZendTest.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation\Rules;
 
 use DateTime;
@@ -23,7 +25,7 @@ use Zend\Validator\ValidatorInterface;
  */
 class ZendTest extends TestCase
 {
-    public function testConstructorWithValidatorName()
+    public function testConstructorWithValidatorName(): void
     {
         $v = new Zend('Date');
         self::assertAttributeInstanceOf(
@@ -36,7 +38,7 @@ class ZendTest extends TestCase
     /**
      * @depends testConstructorWithValidatorName
      */
-    public function testConstructorWithValidatorClassName()
+    public function testConstructorWithValidatorClassName(): void
     {
         $v = new Zend(ZendDate::class);
         self::assertAttributeInstanceOf(
@@ -46,7 +48,7 @@ class ZendTest extends TestCase
         );
     }
 
-    public function testConstructorWithZendValidatorInstance()
+    public function testConstructorWithZendValidatorInstance(): void
     {
         $zendInstance = new ZendDate();
         $v = new Zend($zendInstance);
@@ -60,7 +62,7 @@ class ZendTest extends TestCase
     /**
      * @depends testConstructorWithZendValidatorInstance
      */
-    public function testUserlandValidatorExtendingZendInterface()
+    public function testUserlandValidatorExtendingZendInterface(): void
     {
         $v = new Zend(new MyValidator());
         self::assertAttributeInstanceOf(
@@ -70,7 +72,7 @@ class ZendTest extends TestCase
         );
     }
 
-    public function testConstructorWithZendValidatorPartialNamespace()
+    public function testConstructorWithZendValidatorPartialNamespace(): void
     {
         $v = new Zend('Sitemap\Lastmod');
         self::assertAttributeInstanceOf(
@@ -84,7 +86,7 @@ class ZendTest extends TestCase
      * @depends testConstructorWithValidatorName
      * @depends testConstructorWithZendValidatorPartialNamespace
      */
-    public function testConstructorWithValidatorName_and_params()
+    public function testConstructorWithValidatorName_and_params(): void
     {
         $zendValidatorName = 'StringLength';
         $zendValidatorParams = ['min' => 10, 'max' => 25];
@@ -98,7 +100,7 @@ class ZendTest extends TestCase
     /**
      * @depends testConstructorWithValidatorName
      */
-    public function testZendDateValidatorWithRespectMethods()
+    public function testZendDateValidatorWithRespectMethods(): void
     {
         $v = new Zend('Date');
         $date = new DateTime();
@@ -111,7 +113,7 @@ class ZendTest extends TestCase
      * @depends testZendDateValidatorWithRespectMethods
      * @expectedException \Respect\Validation\Exceptions\ZendException
      */
-    public function testRespectExceptionForFailedValidation()
+    public function testRespectExceptionForFailedValidation(): void
     {
         $v = new Zend('Date');
         $notValid = 'a';
@@ -130,7 +132,7 @@ class ZendTest extends TestCase
      * @depends testZendDateValidatorWithRespectMethods
      * @expectedException \Respect\Validation\Exceptions\ZendException
      */
-    public function testParamsNot()
+    public function testParamsNot(): void
     {
         $v = new Zend('StringLength', ['min' => 10, 'max' => 25]);
         self::assertFalse($v->assert('aw'));
diff --git a/tests/unit/ValidatorTest.php b/tests/unit/ValidatorTest.php
index 24aa6ea0..8d82f535 100644
--- a/tests/unit/ValidatorTest.php
+++ b/tests/unit/ValidatorTest.php
@@ -9,6 +9,8 @@
  * file that was distributed with this source code.
  */
 
+declare(strict_types=1);
+
 namespace Respect\Validation;
 
 use PHPUnit\Framework\TestCase;
@@ -16,12 +18,12 @@ use Respect\Validation\Exceptions\ComponentException;
 
 class ValidatorTest extends TestCase
 {
-    public function testStaticCreateShouldReturnNewValidator()
+    public function testStaticCreateShouldReturnNewValidator(): void
     {
         self::assertInstanceOf(Validator::class, Validator::create());
     }
 
-    public function testInvalidRuleClassShouldThrowComponentException()
+    public function testInvalidRuleClassShouldThrowComponentException(): void
     {
         $this->expectException(ComponentException::class);
         Validator::iDoNotExistSoIShouldThrowException();
@@ -30,7 +32,7 @@ class ValidatorTest extends TestCase
     /**
      * Regression test #174.
      */
-    public function testShouldReturnValidatorInstanceWhenTheNotRuleIsCalledWithArguments()
+    public function testShouldReturnValidatorInstanceWhenTheNotRuleIsCalledWithArguments(): void
     {
         $validator = new Validator();