[swift-evolution] [Request for Feedback] Providing defaults for <Codable> reading and writing.

[Greg Parker]

> On Jul 10, 2017, at 5:16 PM, William Shipley via swift-evolution <swift-evolution at swift.org> wrote:
> 
> (Note the horrible hack on KeyedEncodingContainer where I had to special-case arrays of <Equatable>s, I guess because the compiler doesn’t know an array of <Equatable>s is Equatable itself?)

Correct. Swift does not yet have the necessary language machinery to express "Array<T> is Equatable whenever T is Equatable". 

SE-0143 "Conditional conformances" is approved but not yet implemented.
https://github.com/apple/swift-evolution/blob/master/proposals/0143-conditional-conformances.md <https://github.com/apple/swift-evolution/blob/master/proposals/0143-conditional-conformances.md>


-- 
Greg Parker     gparker at apple.com <mailto:gparker at apple.com>     Runtime Wrangler


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