[issue39943] Meta: Clean up various issues in C internals

[STINNER Victor]

STINNER Victor <vstinner at python.org> added the comment:

What is the rationale for adding const? For example, does the PR 19185 fix any compiler warning or any bug? While PR 19185 is correct, I am not sure that we should modify the 607K lines of C code of CPython to add const everywhere. I'm fine with using const for new code, but I'm not sure that it's worth it to modify exiting code.

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