Yeah, remove will work for one kind of 'multiset' operator I am thinking of. The others might as well preserve as much order as possible. For instance, (add [1 2 3 4] [1 2 3 4]) could have two interpretations; you just append, or you add like elements to positions of like elements, so you get [1 1 2 2 3 3 4 4]. I guess you could specify that with a flag :append vs. :match. I'd also have a flag to choose eager evaluation vs. lazy (sometimes it's nice to preserve the collection type, and you don't need lazy evaluation for collections.). The "native" multiset type could be the map type you suggested, and that would be used to determine equality.
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