[swift-evolution] [Draft] Rename Sequence.elementsEqual

[Jonathan Hull]

Also of interest to this discussion is the following from a discussion on C#’s version of Set:

> HashSet<T> is more or less modeled after a mathematical set <http://en.wikipedia.org/wiki/Set_(mathematics)>, which means that:
> 
> It may contain no duplicate values.
> Its elements are in no particular order; therefore the type does not implement the IList<T> <http://msdn.microsoft.com/en-us/library/5y536ey6.aspx>interface, but the more basic ICollection<T> <http://msdn.microsoft.com/en-us/library/92t2ye13.aspx>. As a consequence, elements inside a hash set cannot be randomly accessed through indices; they can only be iterated over through an enumerator.
So, it appears that C#/.Net does in fact take into account the fact that Sets are unordered, and only allows it to be iterated (as opposed to accessed with indices).

Thanks,
Jon
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