Erez Zinman <erezinman.program...@gmail.com> added the comment:

The first argument can be remedied by creating a new method that deals with 
that (something like `def _new_init(cls)`, and passing the `cls` as argument).

The third argument is not really an argument - there is a bug that needs a 
precedent to be solved.

Concerning the second argument, I think it is only problematic when pickling in 
a new version of python and unpickling in an old one, and not vice versa 
(because the reduction from previous versions calls __init__). In the old->new 
direction, there wouldn't be much of a problem because the worst thing that 
happens, is that this bug could occur.
If that doesn't satisfy you, I hope that this change can be made in the future, 
when a version that allows such a lack of backward-compatibility is released.

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<https://bugs.python.org/issue41751>
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