[issue29897] itertools.chain behaves strangly when copied with copy.copy

[Raymond Hettinger]

Raymond Hettinger added the comment:

> Perhaps all this deserves a PEP.

If Serhiy and Kristján are on a course of action, that will suffice.  Copying iterators is an esoteric endeavor of interest to very few users (no one has even noticed until now).

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue29897>
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