STINNER Victor <vstin...@python.org> added the comment:

> Argument Clinic and the inspect module do not support this case.

That's why I used -1 and None.

> But -1 and None are incorrect values for many parameters, and even if they 
> would be correct, they are not default values. By default, if you do not 
> specify some argument, the value of the corresponding attribute would not be 
> changed.

If you consider that this issue matters, you may hack the code to accept None 
as if no parameter was passed (pass NULL).

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue42291>
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