Andrew,

I have questions about the following part of commit bf9d118779f5:
+ PyTclObject_Type_slots[3].pfunc = PyObject_GenericGetAttr;

First, the "3" refers to the position of Py_tp_getattro in the array, which is a fragile thing IMO.

Then, this hack was not necessary before; why is it needed now?
IIRC on Windows a static initializer cannot contain dll-imported variables, but function pointers are OK.
Or do you have evidence of the contrary?