PEP 803 is a collection of smaller changes, most approved and implemented individually. See #69 and #72 for previous C API WG votes. Here is the final change to the C API that it proposes. See the PEP for context and rejected ideas.

Should we recommend that the SC approves the C API changes in PEP 803?
That is, starting with the next version of the Limited API (i.e. 3.15+, if nothing changes) should:

• make the PyObject, PyVarObject, PyModuleDef_Base, PyModuleDef structs opaque
• do not define the PyObject_HEAD, _PyObject_EXTRA_INIT, PyObject_HEAD_INIT, PyObject_VAR_HEAD, Py_SET_TYPE macros
• make this version of Limited API & Stable ABI compatible with free-threading

(That is, you get the effect of defining _Py_OPAQUE_PYOBJECT in current main. I plan to implement it that way.)

Note that PEP 809 proposes the same changes (and more).

• @encukou
• @erlend-aasland
• @serhiy-storchaka
• @vstinner
• @zooba (-1)