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gh-102433: Add tests for how classes with properties interact with isinstance() checks on ...

Ubuntu SSL tests with OpenSSL (3.0.8) Ubuntu SSL tests with OpenSSL (3.1.0-beta1) ...
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Error If Return Annotation Is Provided (Generics + TypeVar + isinstance)

The only difference in those two classes are that one of them declares an explicit None return annotation. Environment Mypy version used: 0.950 and 0.960 Mypy command-line flags: None Mypy ...