STINNER Victor added the comment:
Oops, I forgot to attach decimal-2.patch, here you have.
> I would dissuade from direct using of FASTCALL, but Argument Clinic is enough
> reliable.
I wrote decimal-2.patch in a few minutes, when I was trying to find all
functions still calling _PyStack_AsTuple() in my tp_fast{new,init,call} fork. I
just wrote it to identify which parts of CPython can be optimized to make
bm_telco faster.
I agree that Argument Clinic should be preferred over using directly
METH_FASTCALL, especially for the _decimal module: Stefan already wrote that he
wants to have the same code base on Python 3.5, 3.6 and 3.7.
> I would recommend to use Argument Clinic unless Stefan supports external fork
> of the decimal module and is limited by public API.
What is the status of Argument Clinic? Is it something "public" or not?
The status of _decimal is also unclear to me. Is it part of CPython or not? :-)
I know that there is also a "backported" module for Python 2:
https://pypi.python.org/pypi/cdecimal
http://www.bytereef.org/mpdecimal/index.html
IMHO it's a great tool. Maybe it's time to make it usable outside CPython in
Python 3.7? Or maybe we should wait until the remaining missing features are
implemented? Issues #20291 and #29299 for example.
I'm now waiting for Stefan's feedback ;-)
----------
Added file: http://bugs.python.org/file46435/decimal-2.patch
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