Suppose I have a vector v. I would like to add a new element to v distinct from all of the elements of v, with the constraint that I assume nothing about v other than it is a vector. (There are cases where it is useful to do this with some algorithms involving reduce, for example.) One way to do this is (conj v v). Is the overhead of doing this in clojure the addition of a pointer (of some kind) to v, or is it something else?
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