Gregory Beauregard <g...@greg.red> added the comment:

List[42] is already accepted, and your proposed patch does not change it to 
make it not accepted. The issue is _type_check is only called in a few 
particular locations; this is part of the technical reason I'm not very 
concerned about relaxing the _type_check requirements.

>From a type checking philosophy point of view I agree with Jelle and am 
>negative on strict runtime requirements in typing.py.

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<https://bugs.python.org/issue46644>
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