[swift-dev] State of String: ABI & Performance

[Ben Cohen]

> On Jan 11, 2018, at 12:32 PM, Michael Ilseman via swift-dev <swift-dev at swift.org> wrote:
> 
> For a more general solution, I think a `var numericValue: Int? { get }` on Character would make sense. Unicode defines (at least one) semantics for this and ICU provides this functionality already.
> 

Minor style point – this should be a failable init on Int rather than a computed property on Character

i.e. Int.init?(_: Character), matching Int.init?(_: String, radix: Int = 10), only it doesn’t need the radix arg cos it’s only a single character.

If implemented inside the std lib, it can still access character’s internals, which is a reasonable thing to do for something so performance-sensitive.

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