What is the preferred way getting a vector back from sequence, after a
sequence producing operation (like sort)? Does using (vec..) on a
sequence that was a vector is costly?
One (bad?) possibility is creating a new vector out of sequence:
(vec (sort [1 2 3 4 5 6]))
I am asking because I need random access (nth ..) to huge sorted
vectors - which are now actually huge sequences after the sort, with
horrible O(n) random access time
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