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The change you are observing is that special methods are now 
only looked up on the *class* of the object concerned.  This, or 
something like this is actually unavoidable -- in

>>> repr(o)

what do you do if both o and the type of o define a __repr__ 
method?

There are articles on new-style classes out there that should 
explain this in more depth.  It probably could/should be 
documented better in the core -- there are bugs open to that 
effect already.

Closing.