Logged In: YES 
user_id=908995

set patch filed as SF #1062353

I just realized that neither of these patches do anything to
handle __slots__, but I'm not even sure if it's necessary.
At least _reduce_ex tells such classes to write their own
getstate, and such subclasses of set or deque can always
write their own reduce, so lack of such support doesn't make
anything impossible--it just might require a little more
work on the user's part.