EnumSet as SequencedSet

[M. Justin]

Out of curiosity, is there a reason EnumSet doesn't implement SequencedSet
in the Java 21 Sequenced Collections feature?  Other than not currently
having a reversed() implementation, it feels like it meets the requirements
for this interface.  It would have to throw UnsupportedOperationException
for addFirst and addLast, but that's no different than what SortedSet does.

I suppose technically, there isn't any reason EnumSet couldn't have
implemented SortedSet (aside from implementation complexities with
supporting sublists in headSet()/subSet()/tailSet()), given that it already
is a set which is ordered based on its elements' natural ordering.
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