Currently we have
class A(Generic[T]):
x = None
A[int].x = 1
A[str].x = 'a'
print(A[int].x) # prints 1
print(A[int]().x) # prints None, since type is erased on instantiation
@JukkaL argues and I agree with him, that this looks wrong. Conceptually, there should be only one runtime class. I think we can implement this without loosing the current runtime generic information by tweaking descriptor __dict__ of GenericMeta, so that all assignments and look-ups on subscripted class objects like A[int] will be transferred to the original class object A.
@gvanrossum What do you think?
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