I created this issue to disallow macros like PyFloat_AS_DOUBLE() and PyDict_GET_SIZE() as l-value. It seems like this change by itself is controversial.

I proposed one way to implement this change: convert macros to static inline functions. I didn't expect that this conversion would be also controversial. For now, I abandon the static inline approach, to focus on the implementation which keeps macros: modify macros to use _Py_RVALUE() => PR 28976.

Once the PR 28976 will be merged and the PEP 670 will be accepted, we can reconsider converting these macros to static inline functions, then it should be non controversial.