Bug report

ArrayAccess offsetSet mistakenly detected as assignment of the property itself.

Code snippet that reproduces the problem

https://phpstan.org/r/a97143d1-7447-4a63-8b43-683f17783572

Expected output

Since WeakMap implements ArrayAccess the $this->cache[$key] = $value assignement wont update the object itself but calls a method on it. I think it should not generate the warning.

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