I don't know if I'm running into a bug or I'm just not doing things right. I was able to minimize my problem to this using Python 3.5 and mypy 0.660: from abc import ABC, abstractmethod from typing ...
Extract from the current prototype of typing in this repo: For an unconstrained type variable T, isinstance(x, T) is false for all x, and similar for issubclass(cls, T). Example:: T = TypeVar('T') ...
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