[issue2480] eliminate recursion in pickling

[Alexandre Vassalotti]

Alexandre Vassalotti <alexandre at peadrop.com> added the comment:

I am closing this issue in favour of #3119, since Aaron's patch is
cleaner and slightly faster.

Thank you Daniel for the idea!

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dependencies:  -pickle.py is limited by python's call stack
resolution:  -> duplicate
status: open -> closed
superseder:  -> pickle.py is limited by python's call stack

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