The classes that are children of "AbstractInterval" convert their values
before comparing them.
Because PHP tries to convert values when making comparisons and an
"DateTime" object cannot be converted to integer or float some
validations would result into PHP triggering an error like:
> Object of class DateTime could not be converted to int
> Object of class DateTime could not be converted to float
This commit prevents that to happen by verifying if both compared values
are scalar or not before comparing them with each other.
Signed-off-by: Henrique Moody <henriquemoody@gmail.com>
Since the rule "LessThan" was created, there is no reason to allow "Max"
to not be inclusive.
Also apply contribution guidelines to the rule.
Signed-off-by: Henrique Moody <henriquemoody@gmail.com>
