scala-library-next
                                
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                        Add SeqSet
Add SeqSet, mirroring SeqMap.
Note: without adding new implementations for the new traits, this depends on #21
thoughts on this change? (👍 in favour, 👎 against)
So, we would have LinkedHashSet as a concrete subtype of SeqSet?
yes, although it will take some fiddling to make that actually work in scala-library-next (if it's not final, we might be able to subtype it with a mixin?)
We'd want VectorSet as well: #168