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

[Amaury Forgeot d'Arc]

Amaury Forgeot d'Arc <amauryfa at gmail.com> added the comment:

What about using PyNumber_AsSsize_t? it uses PyNumber_Index to accept
integral-like types, and refuses floats.

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nosy: +amaury.forgeotdarc

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue3729>
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