[issue3729] SystemError on calling len() if __len__() doesn't return an int

[Hagen Fürstenau]

Hagen Fürstenau <hfuerstenau at gmx.net> added the comment:

Of course we can do both: Accept integral-like types and reset the
exception text. The new patch does this and adds a test for the new
behaviour.

Review carefully - I'm a newbie! ;-)

Added file: http://bugs.python.org/file11308/len_check2.diff

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