[swift-evolution] [Pitch] String revision proposal #1

[Ben Cohen]

> On Mar 30, 2017, at 2:03 PM, Karl Wagner via swift-evolution <swift-evolution at swift.org> wrote:
> 
> So, running with the parallel, why not add a conditional conformance: "Slice: Unicode where Base: Unicode”?
> 

Primarily because this would rule out giving substrings the “small string optimization" where we pack the characters into the struct directly when they’ll fit.

(or rather, given substrings will be 2-3 words, the not-even-that-small string optimization)


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