Hi Jeroen,
My initial plan was to hide it to ensure that nobody uses it, wait until
the code and the API is battle-tested, and then propose a public API. I
was a good idea to not make it public in the first place, since Python
3.7 modified FASTCALL deeply to not include keyword parameters by
default (need METH_FASTCALL | METH_KEYWORDS).
But Cython decided to use it, it was not well hidden enough :-) Then the
PEP 590 did what I planned to do: polish the API and make it public
(good job! it optimizes more cases than FASTCALL, especially methods).
Well, yes, it should now be documented, since it's already in used in
the wild. We may deprecate it and document that VECTORCALL should be
preferred.
Victor
Le 13/06/2019 à 09:29, Jeroen Demeyer a écrit :
Hello,
has the time come to document METH_FASTCALL? This was introduced in
Python 3.6 for positional arguments only and extended in Python 3.7 to
support also keyword arguments. No changes have been made since then.
The vectorcall protocol (PEP 590) uses a calling convention based on
METH_FASTCALL, so I expect METH_FASTCALL to stay as it is. PEP 590 also
means that CPython is now even more than before optimized for
METH_FASTCALL instead of METH_VARARGS.
Whether or not METH_FASTCALL should be added to the limited API is
another question. I'm only talking about adding it to the documentation.
Jeroen.
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