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

Is this a matter of adding some documentation showing how it should be done? 
Even if we don't want to encourage such subclassing, we do have APIs to support 
it, and I think we ought to show how to do it, given that you have to 
coordinate a bunch of things.

How feasible is it to improve the error? (If that error is what you always get 
when __init__ and __new__ don't agree, maybe that could be a separate, more 
general issue?)

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<https://bugs.python.org/issue46431>
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