That is what == does:
https://github.com/apple/swift/blob/master/stdlib/public/core/HashedCollections.swift.gyb#L1267
> On Oct 15, 2017, at 1:25 PM, C. Keith Ray via swift-evolution
> <swift-evolution@swift.org> wrote:
>
> Why not use an equals Implementation that doesn't rely on order?
>
> Something like this (which doesn't compile in my iPad playground). If two
> sets have the same number of elements, and every element in one can be found
> in the other, they are equal, otherwise they are not equal.
>
> protocol Set {
> static func == (lhs: Self, rhs: Self) {
> guard lhs.count == rhs.count else { return false }
> for x in lhs {
> if !rhs.contains(x) { return false }
> }
> return true
> }
> }
>
> --
> C. Keith Ray
>
> * https://leanpub.com/wepntk <https://leanpub.com/wepntk> <- buy my book?
> * http://www.thirdfoundationsw.com/keith_ray_resume_2014_long.pdf
> <http://www.thirdfoundationsw.com/keith_ray_resume_2014_long.pdf>
> * http://agilesolutionspace.blogspot.com/
> <http://agilesolutionspace.blogspot.com/>
>
> On Oct 15, 2017, at 12:40 PM, Kevin Nattinger via swift-evolution
> <swift-evolution@swift.org <mailto:swift-evolution@swift.org>> wrote:
>
>>> […]
>>> Swift's Sequence protocol does not require the order of iteration to
>>> "convey any meaning"; it doesn't even require it to be deterministic.
>>>
>>
>> And that’s EXACTLY why none of the functions on Sequence should rely on the
>> order conveying meaning. `ElementsEqual` (for example) DOES rely on the
>> order of iteration conveying a meaning not required by the protocol, and
>> renaming it `lexicographicallyEquals` does not change that fact. Either
>> Sequence needs to require a meaningful order or `elementsEqual` should be
>> moved to a protocol that does.
>>
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