Move it to the internal C API and no longer export it.
PyAPI_FUNC(void *) PyObject_GetItemData(PyObject *obj);
PyAPI_FUNC(int) PyObject_VisitManagedDict(PyObject *obj, visitproc visit, void *arg);
-PyAPI_FUNC(int) _PyObject_SetManagedDict(PyObject *obj, PyObject *new_dict);
PyAPI_FUNC(void) PyObject_ClearManagedDict(PyObject *obj);
_Py_ANNOTATE_FORMAT_STRING = 4,
};
-int _PyObject_SetDict(PyObject *obj, PyObject *value);
+extern int _PyObject_SetDict(PyObject *obj, PyObject *value);
+extern int _PyObject_SetManagedDict(PyObject *obj, PyObject *new_dict);
#ifndef Py_GIL_DISABLED
static inline Py_ALWAYS_INLINE void _Py_INCREF_MORTAL(PyObject *op)