Bug report

Bug description:

Thedocumentation is clear that it issize_t

However if yousearch the Python source fornargs, it is oftenPy_ssize_t

One is signed and the other is unsigned. It looks like argument clinic is one culprit.

Ordinarily this is no big deal, because it would take too many arguments to overflow. However the clang undefined behaviour sanitizer gets upset when the sign on that parameter is wrong. See#111178 for why that matters.

I discovered this because I had copied argument clinic usingPy_ssize_t and then hit ubsan issues.

CPython versions tested on:

3.14

Operating systems tested on:

Linux