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

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

> The doc does not specify that 'length' cannot be non-negative.

It does. https://docs.python.org/3/reference/datamodel.html#object.__len__

.. method:: object.__len__(self)

   Called to implement the built-in function :func:`len`.  Should return the length
   of the object, an integer ``>=`` 0.

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resolution:  -> fixed
stage: patch review -> resolved
status: open -> closed

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