Feature request

Hi, thanks for one of the best tools - phpstan! I have one suggestion, this is sample code: https://phpstan.org/r/9e546c06-b23c-46c0-a6a0-b6239bfea4a6

When we declared static property in class, and use it as non-static in isset() function, then always get false. It is no problem when use without isset, because parser return an error, but it would be nice if phpstan could help detect usage in isset for example.

What do you think about it?

Best regards!

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