[issue20341] Argument Clinic: add "nullable ints"

[Larry Hastings]

Larry Hastings added the comment:

I should have mentioned--a sample using nullable ints is in itertoolsmodule.c.  longobject.{ch} changed to add the converters, and obviously clinic.py changed to add support for the converters.

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<http://bugs.python.org/issue20341>
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