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From the discussion of issue 643841:
>>> class Demo:
... def __index__(self):
... return 1
...
>>> a = Demo()
>>> b = weakref.proxy(a)
>>> operator.index(a)
1
>>> operator.index(b)
Traceback (most recent call last):
 File "<stdin>", line 1, in <module>
TypeError: 'weakproxy' object cannot be interpreted as an index
The weakref proxy types need to be updated to delegate 2.5's new
tp_index slot.

Marking as easy - it should be possible to just look at what the code in
Objects\weakref.c is already doing for slots like tp_len and tp_int and
do the same thing for tp_index.

Fixed in r63500, together with the floor/truediv slots.