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FYI, I was able to work around this and use an unmodified Python by
subtyping type and overriding the setattr method as shown below. It's a
lot messier than patching Python.
static int
Mutable_SetAttr(PyObject *obj, PyObject *name, PyObject *value)
{
 // Can't just call PyObject_GenericSetAttr because
 // we need to able to update the __str__ slot as well.
 PyTypeObject *type = reinterpret_cast<PyTypeObject*>(obj);
 type->tp_flags |= Py_TPFLAGS_HEAPTYPE;
 int result = PyType_Type.tp_setattro(obj, name, value);
 type->tp_flags &= ~Py_TPFLAGS_HEAPTYPE;
 return result;
}