issue28754-4.diff does 3 things:
* convert C code to Argument Clinic
* change docstrings of the C code
* change unit tests

issue28754-5.diff doesn't touch tests, but still does 2 things. Sadly, I dislike the changes on docstrings because it makes the C docstring and the Python docstring inconsistent.

I suggest to copy/paste docstring between C and Python code.

By the way, why do we have a docstring different from Doc/library/bisect.rst? Maybe we can simply use the same doc everywhere, but just add reST formatting in Doc/library/bisect.rst?

Julien: I suggest to first restrict your change to Argument Clinic, and later write a new patch to update docstrings. I prefer to only do one thing per commit.