[issue3119] pickle.py is limited by python's call stack

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

It would be nice to support unlimitedly nested structures. C stack is more hard limit than Python stack. But the code of the pickle module (especially C implementation) is complicated and hardly optimized. I think it would be not easy to implement stackless version without significant loss of speed and readability. You can try, but I don't have much hope.

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versions: +Python 3.7 -Python 3.6

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<http://bugs.python.org/issue3119>
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