Optional callable parameters are not enforced

[5lava]

Bug report

PHPStan does not enforce callable parameters to be optional to match the expected callable signature declared in PHPDoc.

Code snippet that reproduces the problem

https://phpstan.org/r/6323d45a-fbf0-4f3a-a150-e7ce34fb39d1

Expected output

Parameter #1 $c of function foo expects callable(int=): void, Closure(int): void given.

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[ondrejmirtes]

Had to revert the fix: phpstan/phpstan-src#1354

[stof]

@ondrejmirtes the phpdoc in doctrine/collections is now fixed in doctrine/collections#323

So this could be re-applied once the fix is tagged.

[stof]

And this is now released: https://github.com/doctrine/collections/releases/tag/1.7.2

[ondrejmirtes]

Fixed: phpstan/phpstan-src#1354

[github-actions]

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