[issue38938] Iterable merge performance and inclusion in itertools

[Raymond Hettinger]

Change by Raymond Hettinger <raymond.hettinger at gmail.com>:


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assignee:  -> rhettinger
versions:  -Python 2.7, Python 3.5, Python 3.6, Python 3.7, Python 3.8

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue38938>
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