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In clojure lists grow from the left and vectors grow from the right, so:
user> (conj '(1 2 3) 4)
(4 1 2 3)
user> (conj [1 2 3] 4)
[1 2 3 4]
What’s the most efficient method of inserting values both into the front and the back of a sequence?
You need a different data structure to support fast inserting at both start and end. See https://github.com/clojure/data.finger-tree