Message 185668 - Python tracker

Py_INCREF usable as an rvalue sounds more like an accident than a deliberate feature, and it would be IMO counter-productive to codify this behaviour in the docs.

As for the lvalue usage of Py_REFCNT and Py_SIZE, I think it would be better if it were limited to CPython core. But arguably writers of extension types may want to mutate the size field of a varsize object.