[issue20341] Argument Clinic: add "nullable ints"

[Larry Hastings]

Larry Hastings added the comment:

The bug you saw was an easy fix; the converter function needs to return 1 (success) from the "== Py_None" branch.

And yes, more unit tests would be good, fixing the documentation would be good too.  I did say the patch was nowhere near ready.

I will assume unless I hear otherwise that I should proceed with the patch and flesh out all the different and float types.

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