[issue20341] Argument Clinic: add "nullable ints"

[Antoine Pitrou]

Antoine Pitrou added the comment:

> > int(or_none=True) ?
> 
> Yes, that is a different name that seems to mean much the same thing.

and which is much more understandable by a Python developer.

> Changing error to an char and moving it to the end would
> save exactly zero bytes, because the compiler *will* align
> stack variables to 4 byte boundaries.

Except if other stack variables happen to be shorter than an int,
perhaps. But regardless, it doesn't cost anything to do so, so why not
do it?

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