On Wed, Jul 1, 2020, at 08:23, Joao S. O. Bueno wrote:
> collections.mixins.SlicedSequence that would override `__delitem__`, 
> `__setitem__` and `__getitem__` and 
> handle slices could pair up with the "ComparableSequence" - people 
> could use these "a la carte", and 
> no backwards compatibility would be hurt.

This one raises the question of where you put the single-item accessors. And 
sliced __delitem__ may be difficult to implement efficiently without knowing 
the internals of the sequence type.
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