[issue29839] Avoid raising OverflowError in len() when __len__() returns negative large value

[Serhiy Storchaka]

Changes by Serhiy Storchaka <storchaka+cpython at gmail.com>:


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assignee:  -> serhiy.storchaka

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue29839>
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