I wanted to create a union of the keys from two maps.
When I write
(clojure.set/union (keys {:a 1 :b 2 :c 3}) (keys {:a 1 :b 2 :c 3}))
I get a result of (:b :c :a :a :c :b).
When I write (set (clojure.set/union (keys {:a 1 :b 2 :c 3}) (keys {:a 1 :b
2 :c 3})))
the result is #{:a :c :b}.
The document of clojure.set/union describes that the function "Return a set
that is the union of the input sets".
As it seems the function keys does not return a set and so the returning
result is not a set too. Correct?
And that this is the reason, that the keys are duplicated in the returning
"list".
I wonder know is this is a bug or not. And what the normal behaviour of the
function should be in this case?
Should it throw an Exception, because the passed parameters are not sets,
should it return a set, even if the passed parameters are no sets or should
the desciption of the function should be changed to express that a list
(with eeventually duplicated entries) is returend, if the passed parameters
are lists?
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