It looks like the behaviour of some clojure.set functions is either
undefined or possibly erroneous when called with non-set arguments:
user> (clojure.set/union #{:a :b} [:b :c])
#{:a :c :b}
user> (clojure.set/union #{:a} [:b :c])
[:b :c :a]
Seems likely that the behaviour in such cases is just undefined, but I
wonder if it would be worth calling set on each argument just to avoid
weird edge-case bugs. Is it a cheap operation to call set on a set?
-Phil
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