[issue24874] Improve pickling efficiency of itertools.cycle

[Roundup Robot]

Roundup Robot added the comment:

New changeset 17b5c8ba6875 by Raymond Hettinger in branch 'default':
Issue #24874: Speed-up itertools and make it pickles more compact.
https://hg.python.org/cpython/rev/17b5c8ba6875

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nosy: +python-dev

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue24874>
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