Problem with POST data types

It was converted to int implicitly by PHP.
But in 4.5.0 "declare(strict_types=1);" has been added to most of the framework codebase.
See https://www.php.net/manual/en/language.t...ons.strict
Because if devs expect int values, string values should not pass the validation.

So now it is not converted implicitly, and causes TypeError.

> Sorry this is not a bug, but an intended behavior of PHP.

This sentence was not precise. PHP's default behavior is to convert implicitly,
but now we use strict mode for strict type coding.

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