Feature or enhancement
Starting in Python 3.12, it is possible to receive vector calls in the limited API. However, it is not possible to issue them from a binary extension module compiled for the limited API.
Pitch
Since the PEP-590 is presumably stable at this point, I propose exposing more of it through the limited API. This would entail the functions
PyObject_VectorcallPyObject_VectorcallMethodPyObject_VectorcallDictPY_VECTORCALL_ARGUMENTS_OFFSET(a macro constant that is needed to use these effectively)
Previous discussion
Some related discussion took place here: https://discuss.python.org/t/ideas-for-forward-compatible-and-fast-extension-libraries-in-python-3-12. This PR Is specifically about item #5 from the list in the first post.