@methane: Py_INCREF and Py_DECREF have been converted to static inline functions. So I came back to _Py_Dealloc() as you asked me, and it seems like I found a solution to handle properly this one:

• " PyAPI_FUNC(void) _Py_Dealloc(PyObject *); " is now always declared the same way with any C define and it is now always implemented in object.c at the same place (previously, there were two implementations, depending if Py_TRACE_REFS)
• Name the inlined flavor "_Py_Dealloc_inline" and use #define _Py_Dealloc(op) _Py_Dealloc_inline(op), so the name doesn't conflict depending if Py_LIMITED_API is defined or not

@serhiy-storchaka: You asked interesting questions, but I merged my change anyway.

For the coding style, if you want to change it: please write a separated PR to reformat all "static inline" at once, not only these ones.

For _Py_Dealloc() race condition: if you consider that it's a bug, please open a new issue. My commit doesn't change the code, it only moves the code.