"Optional parameter declared before required parameter" with NULL default is not reported in PHP 8.1

[luxemate]

Bug report

In PHP 8.1 this code throws a deprecation warning: https://3v4l.org/ZV6On

Whereas PHPStan ignores the optional parameter if it has a NULL default.

Code snippet that reproduces the problem

With string default there's an error: https://phpstan.org/r/3b7755fa-3d5f-4c4f-a908-1fab2e418da3
With NULL default there's no error: https://phpstan.org/r/66ee3543-d33b-445b-ba59-8ef61fb76c98

Expected output

Deprecated: Optional parameter $arg2 declared before required parameter $arg3 is implicitly treated as a required parameter

[ondrejmirtes]

Implemented phpstan/phpstan-src#2963

[github-actions]

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