Work in progress for fixing this bug. (See descr_v1.diff) I converted the "curious.py" file into additional testcases. I started writing the functions for the tp_call slots for class and static methods.

To do: add tests to make sure that the code works for more than what's accepted by function_call(), then switch to using PyObject_Call() (which is the right function to use here, thanks to ncoghlan for catching that). Will finish this in the next few days.