I don't love it but given how long we've spent discussing this and you've spent 
thinking about it I can believe it's the answer that makes the most sense. I do 
have one question: what are 'element(_:subsumes:)' and 
'element(_:isDisjointWith:)' for? Imported option sets with non-orthogonal 
options? I know that's not that uncommon, but I don't know why I would need 
dedicated operations for it, especially when these types have Element == Self.

(The naming guidelines also fall down on static methods like this. The base 
name doesn't describe the operation at all.)

Jordan

> On Mar 24, 2016, at 13:39, Dave Abrahams via swift-evolution 
> <[email protected]> wrote:
> 
> 
> Just an update:
> 
> The naming guidelines working group went back into negotiation over
> the shape of SetAlgebra (and thus, Set and OptionSet) for
> Swift 3, and reached a new consensus.  We intend to bring forward a
> proposal for the API shown here:
> 
>  http://dabrahams.github.io/swift-naming/SetAlgebra-Math.html
> 
> and to update the guidelines to suggest using the "form" prefix to
> create a verb phrase for a mutating method when the operation is
> fundamentally non-mutating and described by a noun.
> 
> Regards,
> 
> -- 
> Dave
> 
> _______________________________________________
> swift-evolution mailing list
> [email protected]
> https://lists.swift.org/mailman/listinfo/swift-evolution

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