Guido van Rossum <gu...@python.org> added the comment:

I really don't recall if we even seriously considered what 
isinstance(list[int], type) should return. PEP 585 doesn't mention it. I 
presume it falls out of the way it's being tested and the way list[int] passes 
most attribute requests on to the origin (i.e., to list).

Given that this has returned True for two releases now I'm very reluctant to 
changing this now. So our best option is pursuing Serhiy's option 1, at least 
partially. The fix for the OP should be simple enough, right?

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<https://bugs.python.org/issue45438>
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