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Fix `issubclass()` to narrow down types of type variables #7930
Thanks for the detailed review! I patched it up in df62cbc
You are right and I shouldn't be in such a hurry.
I had some misunderstanding about this issue from the very beginning and that mistake continues in my testcase. I apologize for that and am trying my best to fill my knowledge gap on type systems(mainly by reading TAPL)
Now I look it again and realize