On 2018-07-05 13:32, INADA Naoki wrote: > Core devs interested in this area is limited resource. I know and unfortunately there is nothing that I can do about that. It would be a pity that PEP 580 (or a variant like PEP 576) is not accepted simply because no core developer cares enough. > As far as I understand, there are some important topics to discuss. > > a. Low level calling convention, including argument parsing API. > b. New API for calling objects without argument tuple and dict. > c. How more types can support FASTCALL, LOAD_METHOD and CALL_METHOD. > d. How to reorganize existing builtin types, without breaking stable ABI. Right, that's why I wanted PEP 580 to be only about (c) and nothing else. I made the mistake in PEP 575 of also involving (d). I still don't understand why we must finish (a) before we can even start discussing (c). > Reference implementation helps discussion. METH_FASTCALL and argument parsing for METH_FASTCALL is already implemented in CPython. Not in documented public functions, but the implementation exists. And PEP 580 also has a reference implementation: https://github.com/jdemeyer/cpython/tree/pep580 Jeroen.
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