>
> https://github.com/apple/swift-evolution/blob/master/proposals/0188-stdlib-index-types-hashable.md
>
> • What is your evaluation of the proposal?
This all seems very sensible, but here's my big question:
AnyIndex, which type erases any index type at run-time, would not be
hashable since it might wrap a non-hashable type.
Why not? Specifically, why shouldn't we require `Hashable` conformance on
indices? Adding it would require changes to conforming types, sure, but indices
are already required to be `Equatable`, and `Hashable` conformance just got
really easy to add, and custom `Collection`s are a relatively rare and advanced
feature.
Is it worth a source break to add it? Personally, I think so—but even if you
disagree, I think we should document why we decided not to add it.
> • Is the problem being addressed significant enough to warrant a change to
> Swift?
Yes.
> • Does this proposal fit well with the feel and direction of Swift?
Yes.
> • If you have used other languages or libraries with a similar feature, how
> do you feel that this proposal compares to those?
N/A.
> • How much effort did you put into your review? A glance, a quick reading, or
> an in-depth study?
Quick reading, nothing more.
--
Brent Royal-Gordon
Architechies
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