Count after calling SplObjectStorage::removeAll

[hultberg]

Bug report

If you call count on a SplObjectStorage before calling SplObjectStorage::removeAll then on subsequent if (count() === 0) calls PHPStan report an error that this check will always be false. Calling removeAll might change the contents. Same problem with removeAllExcept calls.

Strict comparison using === between int<1, max> and 0 will always evaluate to false.

Code snippet that reproduces the problem

https://phpstan.org/r/69cf4869-d279-4876-977c-468f3f5d94a9

Expected output

No errors

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