Parameter #2 $callback of function uasort expects callable(Foo, Foo): int, Closure(string, string): int<-1, 1> given.

[mxr576]

Bug report

This should be also an invalid report since uasort() supports sorting of stringable objects as well based on my testing.

https://3v4l.org/hkZjS

Code snippet that reproduces the problem

https://phpstan.org/r/e0e70f12-61aa-412a-9c1b-dcfa097cfa9d

Expected output

No error is reported.

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[mxr576]

11619 may or may not be related. The code is the same just strnatcasecmp used differently.

[VincentLanglet]

This is a really special edge case.

See https://3v4l.org/GPV8l

With declare(strict_types = 1);:

• strnatcasecmp(Foo::fromString('c'), Foo::fromString('b')) crash
• but using this method in uasort is not crashing

You can reproduce the same behavior https://3v4l.org/DHEoB

PHPStan is working like you were using declare(strict_types = 1); in every of your files ; and here, I feel like it's more a "bug" with PHP which doesn't really respects the strict_types directive.

So I would say it's expected.