On 2019-06-13 14:21, Victor Stinner wrote:
We may deprecate it and document that VECTORCALL should be preferred.
Not really. Vectorcall and METH_FASTCALL solve different problems on different levels.
METH_FASTCALL is used specifically in PythonMethodDef, in other words for instances of "method_descriptor" or "builtin_function_or_method". It has no meaning outside of that.
Vectorcall is meant for classes implementing callables. It is used for example to implement the *classes* "function", "method", "method_descriptor" and "builtin_function_or_method".
The expectation is that most manually written C extensions will be happy with the functionality exposed by "method_descriptor" and "builtin_function_or_method" and they can use METH_FASTCALL.
Cython on the other hand already has a custom class for callables and the expectation is that this class will implement vectorcall.
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