It's not free.
(defn set
Returns a set of the distinct elements of coll.
{:added 1.0}
[coll] (clojure.lang.PersistentHashSet/create ^clojure.lang.ISeq
(seq coll)))
It seems to go element by element, irrespective of whether it was
given a hashset.
Rob
On Oct 18, 9:43 pm, Phil Hagelberg
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
