Do not consider any float as integer

Values like "500.00" or 1.0 should not be considered as integer values
even though there is no data loss when they're converted to integer.

Signed-off-by: Henrique Moody <henriquemoody@gmail.com>

library/Rules/IntVal.php

@@ -15,6 +15,10 @@ class IntVal extends AbstractRule
 {
     public function validate($input)
     {
-        return is_numeric($input) && (int) $input == $input;
+        if (is_float($input)) {
+            return false;
+        }
+
+        return false !== filter_var($input, FILTER_VALIDATE_INT);
     }
 }

tests/unit/Rules/IntValTest.php

@@ -61,6 +61,8 @@ class IntValTest extends \PHPUnit_Framework_TestCase
             [''],
             [null],
             ['a'],
+            ['1.0'],
+            [1.0],
             [' '],
             ['Foo'],
             ['1.44'],