[issue20341] Argument Clinic: add "nullable ints"

[Tal Einat]

Tal Einat added the comment:

Found two bugs in the draft patch in Objects/longobject.c:

1) In _PyLong_NullableIntConverter, there is no index variable, so the Py_DECREF and Py_XDECREF need to be removed from the end of the function.

2) In _PyLong_NullablePy_ssize_tConverter, the index variable will point to a Python object only when both if blocks are skipped. Therefore, the Py_XDECREF after "fail:" at the end of the function needs to be removed.

With these two changes, I successfully used this patch to convert deque_init in Modules/_collectionsmodule.c, simplifying the input validation code considerably.

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