Darren Duncan wrote:
> If a list is a set, does that mean that a list only contains/returns each
> element once when iterated?  If a list can have duplicates, then a list
> isn't a set, I would think. -- Darren Duncan

Thus Mason's point about Bags.  Really, I think that Mason's right in
that we should be looking as which roles each of these does rather
than which classes each of them "is".

Jonathan "Dataweaver" Lang

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