[swift-evolution] 100% bikeshed topic: DictionaryLiteral

[Brent Royal-Gordon]

> On Jan 9, 2018, at 9:04 PM, Brent Royal-Gordon via swift-evolution <swift-evolution at swift.org> wrote:
> 
> The problem is that this isn't currently expressible in the type system. If we can, I would actually support including some kind of unprincipled private hack so we could say `where Element: _AnyTupleOfTwo`.


Sorry, I meant to provide an alternative but forgot.

If we can't do this, I think we should call it something like `PairArray` or `KeyValueArray` and augment its API to bring it closer to parity with `Array`. This type really does have the same semantics as `Array`—integer-indexed, order-preserving, random-access, etc.—and I think we should leverage that fact to make its behavior clear.

`PairArray` sort of vaguely suggests that we should have a `public typealias Pair<K, V> = (key: K, value: V)` in the standard library. I think that's actually a good idea, because we can use it to make sure that we use tuple element labels consistently across various APIs.

-- 
Brent Royal-Gordon
Architechies

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