The proposal draft on Github 
<https://github.com/apple/swift-evolution/pull/290> is now live.

> On May 4, 2016, at 12:13 AM, Developer <[email protected]> wrote:
> 
> I’ve been contemplating this idea for a while now, mostly because I think 
> it’s a very important feature, but also because I can’t find a single example 
> of a programming language getting it completely right.  In Swift, the motif 
> of tuples throughout the language would lead one to think that they have some 
> kind of special status in the language.  Yet, tuples are an opaque concept 
> exposed by the compiler to the end user with no opportunity for extension.  
> Languages that have tried to expose tuples to their users for extension have 
> done so in less than ideal ways (see Tuple1-Tuple22 Scala 
> <https://github.com/scala/scala/blob/2.12.x/src/library/scala/Tuple22.scala>, 
> Haskell 
> <https://github.com/ghc/ghc/blob/master/libraries/ghc-prim/GHC/Tuple.hs>’s 
> hard limit on tuples, Rust 
> <https://doc.rust-lang.org/std/primitive.tuple.html>’s limitations for 
> std::tuple), yet each implementation has something to offer a possible Swift 
> implementation.  I see only one course of action that will bring us 
> extensible tuples in a manner that is compatible with Swift and its overall 
> design philosophy.  To that end, I have drawn up a draft proposal 
> <https://gist.github.com/CodaFi/18b70633b03e19161402ae3579c072b7> for generic 
> tuple extensions that I will submit to swift-evolution shortly.
> 
> All the best,
> 
> ~Robert Widmann
> 
> 

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