Feature or enhancement

Thetp_vectorcall slot can be used with static types to define a more efficient implementation of__new__ /__init__. This slot does not have a typedef in typeslots.h, so it cannot currently be set forPyType_FromSpec or read usingPyType_GetSlot.

In 3.12 other vectorcall functionality looks set to stabilise, so please consider adding aPy_tp_vectorcall typedef and allow heap types to set / get this member.

Pitch

Adding the ability fortp_vectorcall to be used in the limited API enables extension types to make use of the vectorcall optimisation in more functionality.

Previous discussion

I see in#85784 thattp_vectorcall is deliberately inaccessible withPyType_GetSlot because it is not part of the limited API.

If there is support for this proposal, I am happy to have a first stab at implementation.

Linked PRs

• gh-100554: AddPy_tp_vectorcall slot to setPyTypeObject.tp_vectorcall using thePyType_FromSpec function family. #123332
• gh-100554: Fix formatting of type.rst modifications #124066