Convert variable type to int if it was an integer fixes #5688

[rfikree92]

Fixes #5688

Description
convert any variable that is a number to int type, so errors like #5688 doesn't happen.

Checklist:

• Securely signed commits
• Component(s) with PHPDoc blocks, only if necessary or adds value
• Unit testing, with >80% coverage
• User guide updated
• Conforms to style guide

[MGatner]

Inline comment. Also we would need a test to cover this - should be a straightforward adjustment of current tests.

[kenjis]

@rfikree92 Thank you for sending this PR.

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First, please fix coding style. See
https://github.com/codeigniter4/CodeIgniter4/blob/develop/contributing/pull_request.md#php-style
https://github.com/codeigniter4/CodeIgniter4/blob/develop/contributing/pull_request.md#static-analysis-on-php-code

And fix and add unit tests.
https://github.com/codeigniter4/CodeIgniter4/blob/develop/contributing/pull_request.md#unit-testing

[kenjis]

I think the following test cases are needed:

'02471'
'1337e0'
" 42"
"42 "

https://www.php.net/manual/en/function.is-numeric.php#refsect1-function.is-numeric-examples

[kenjis]

#5779 was merged.