Maps, keywords, and symbols when used as operators allow optional second
arguments for 'default-not-found' values is if to 'get'.
E.g.
({:a 1} :b 'b) => b
However sets don't support this behavior (though they do with 'get') and
vectors don't allow the optional default-not-found in their pseudo 'nth'
semantics.
Seems like an inconsistency, any plans to fix it? Or is there some reason
why they were deliberately excluded from supporting similar behavior to
maps, keywords, and symbols?
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