Can a Sequence be infinite? If so, an equality test of two nonterminating sequences would be a nonterminating operation.

Do Sized and *Reversible* imply that a sequence terminates?
Could __len__ return inf?

Perhaps `Ordered` is a requisite condition for defining a comparator for Sequences.
`OrderedSequence`?

Are there unordered Sequences for which a default `__eq__` / `__cmp__` (et. al) would be wrong or inappropriate?

On Fri, Jul 3, 2020, 2:08 AM Random832 <random832@fastmail.com> wrote:
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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