File extension comparison treats some distinct extensions as equal

[Zenexer]

Bug Report

Q	A
Version(s)	HEAD (2.15.x)

Summary

Certain file extensions are considered equal by validators in some contexts. For example, Laminas\Validator\File\ExcludeExtension#isValid will treat file extensions 10 and 010 as equal (example.10 and example.010 have the same file extension in its eyes). This is a result of using == and in_array() without strict mode to check strings. The following both return true in PHP:

'10' == '010';
in_array('10', ['010']);

Expected behavior

example.10 should never be considered to have the file extension 010.

[fgsl]

#104

[gsteel]

Closed via #355