Fix/issue 6791

[rajyan]

fixes phpstan/phpstan#6791

I implemented TypeError throw point in 4450e46 but handled it by writable type.

As in the issue, TypeError is only throwed when the native type is different from the assigned type.
For example,

/** @var int[] */
public array $array

Can assign string[] without TypeError even if it's an error in PHPStan.

[ondrejmirtes]

Thank you, merged :)

[ondrejmirtes]

@rajyan If it doesn' bother you, please also send a regression test for phpstan/phpstan#6786. And base it on the 1.4.x branch, thanks.

[rajyan]

Sure!