Re: [swift-corelibs-dev] NSCoding methods

[Luke Howard via swift-corelibs-dev]

Another language thing I ran into – using classForKeyedArchiver/classForCoder 
is impossible because declarations from extensions cannot be overridden yet.

For example I’d like to do:

internal class _NSCFString : NSMutableString {
… 
    override var classForCoder: AnyClass {
        return NSMutableString.self
    }
}

There are a few ways I can work around it but perhaps we can put these 
extensions directly on NSObject for now?

— Luke
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