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I tried to implement a custom extension type using PyType_FromSpec and Py_LIMITED_API but couldn't implement tp_dealloc:
static void mytype_dealloc(mytypeobject *self)
{
 // free some fields in mytypeobject
 Py_TYPE(self)->tp_free((PyObject *) self); // XXX
}
The line marked XXX will not compile in Py_LIMITED_API because there is no access to the fields of PyTypeObject. There doesn't seem to be any function in the API which just calls tp_free.
I suggest the addition of an API function (to be included in Py_LIMITED_API):
void
PyType_GenericDealloc(PyObject *self)
{
 Py_TYPE(self)->tp_free(self);
}