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Serhiy Storchaka:
> When the fastcall protocol be changed, this would require changing more handwritten code.
I don't plan to modify the fastcall protocol. I'm not sure that it's
really possible to modify it anymore. It would probably be simpler to
add a new protocol. But it may become a little bit annoying to have to
support so many calling convention :-) So someone should come up with
a serious rationale to add another one :-)
I tried to make fastcall as private as possible, but recently I
noticed that METH_FASTCALL is now public in Python 3.6 API (but
hopefully excluded from the stable ABI). I know that it's already used
by Cython since 0.25:
https://mail.python.org/pipermail/cython-devel/2016-October/004959.html
About the maintenance burden, I'm ok to handle it :-) My final goal is
to use Argument Clinic everywhere. While converting existing code to
AC is a slow process, I consider (from my recent experiences with AC)
that the new code is easier to maintain! It's a slow process beause AC
still has limitaitons, but also because it's used an opportunity to
review (and enhance!) the existing docstrings.