[issue20341] Argument Clinic: add "nullable ints"

[Antoine Pitrou]

Antoine Pitrou added the comment:

Some things:
- the concept of a nullable thing in Python doesn't exist; why not "optional"?
- why is there a "error" field in the new structs?
- the fact that the structs are defined in longobject.h looks bonkers
- boolean fields can be "char" instead of "int" (and moved at the end to pack the structure more efficiently)
- PyLong_AsSsize_t can't fail?
- does this change have a performance impact?

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nosy: +pitrou

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