[issue5001] Remove assertion-based checking in multiprocessing

[drallensmith]

drallensmith added the comment:

Patches (for 2.7 and 3.5; the code is identical, only the line numbers changed) for the portion I commented on can be found in issue 31169.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue5001>
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