[swift-evolution] [swigt-evolution] [Pitch] Make NSOrderedSet behave like any other collections from Foundation

[Brent Royal-Gordon]

> Unlike its companion collections like NSArray, NSDictionary, and NSSet, NSOrdered is still a class rather than a struct and has a subclass that is still NSMutableOrderedSet. This should probably receive the same treatment as the other classes

Swift Evolution proposal SE-0069 "Mutability and Foundation Value Types" notes at the bottom <https://github.com/apple/swift-evolution/blob/master/proposals/0069-swift-mutability-for-foundation.md>:

> The following classes were considered and rejected or deferred for the described reasons:
> …
> 	• OrderedSet, CountedSet: We will consider these types in a future proposal.


So sit tight—the Foundation team is already thinking about this. (That doesn't mean you'll necessarily see it this year, though.)

-- 
Brent Royal-Gordon
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