Raymond Hettinger added the comment:

> These broke some concrete Sequence implementations.

Poor choice of words.  The concrete implementations didn't change at all. 

Perhaps the concrete implementation need to be brought more in-sync with the 
ABC.  That would be reasonable; afteralll the goal is substitutability  -- that 
is the only reason that the old xrange morphed into something with nearly 
useless count() and index() methods in the first place.


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