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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