[swift-evolution] [Review] SE-0131: Add AnyHashable to the standard library

[Dmitri Gribenko]

On Mon, Jul 25, 2016 at 1:12 PM, Nate Cook via swift-evolution
<swift-evolution at swift.org> wrote:
>>       https://github.com/apple/swift-evolution/blob/master/proposals/0131-anyhashable.md
>
> +1!
>
> This proposal looks great to me. I only have one nitpick: it looks like there's a '_Hashable' protocol used in the Dictionary extension to get around the limit on generic subscripts. Swift has managed to remove most (all?) underscored protocols from public APIs, so I would just suggest that the implementation consider an alternate name that isn't underscored. Something like 'HashableBase' would still imply that the protocol is more of an implementation detail than a useful protocol on its own.

Hi Nate,

I don't see a benefit for this.  Nobody should be using _Hashable.
Adding it as a non-underscored protocol increases API surface for no
benefit.  _Hashable is slated for removal as soon as we get the
necessary compiler features.

Dmitri

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