docs: replace mixed in system/HTTP/IncomingRequest.php

[totoprayogo1916]

Description
See #6310

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

[kenjis]

Why? Basically the value is a string, and an array if $index is an array.

It can get $filter, so FILTER_CALLBACK can return any type value.
https://www.php.net/manual/en/filter.filters.misc.php

It seems the return type is array|bool|float|int|object|string|null.

[kenjis]

Any get*() method return type is the same?

[totoprayogo1916]

Any get*() method return type is the same?

I don't know yet, get*() only fetches from here
https://github.com/totoprayogo1916/framework-CI4/blob/d239b2a09188b1c28e7ed44a38e0f240216be00a/system/HTTP/RequestTrait.php#L242-L248

[kenjis]

Any get*() method return type is the same.

dd($this->request->getGetPost('test', FILTER_VALIDATE_FLOAT));

Navigate to http://localhost:8080/?test=1.11 and I got:

$this->request->getGetPost(...) double 1.11

The return type of fetchGlobal() also should be array|bool|float|int|object|string|null.

[kenjis]

LGTM!