Alex Waygood <alex.wayg...@gmail.com> added the comment:

I actually have quite a few use cases for this feature. It's true that type 
checkers don't (yet) support it, but that doesn't mean that it should be 
disallowed at runtime. In fact, allowing it at runtime will surely give type  
checkers room to experiment with implementing this feature if it is requested 
by enough users. As it is, they are blocked from doing so.

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<https://bugs.python.org/issue43923>
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