[swift-evolution] Introduce OrderedSet type

Tue May 3 22:24:59 CDT 2016

Hello Swift Community,

Recently I have noticed that there is a Set type but no OrderedSet type yet.
If I want a set that preserves the original order I have to go with
NSOrderedSet
but I think it would be nice to have a native implementation in the
standard library.

What are your thoughts on this?

Thanks!

- Nick
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