You can both avoid efficiency concerns and avoid introducing operations that 
are not idiomatic Clojure that that they will have to unlearn later when other 
Clojure users say their code is weird.

Just:
- There are different kinds of data structures (vector, list, set, map). They 
are better for different uses.
- The generic operation to add an element to a collection is conj.
- conj adds an element in the place best for the collection type. Vector = end, 
list = beginning, sets and maps are unordered so have no expectations 
- hey look vectors and lists are different, choose the one that matches what 
you want (which is probably a vector)

That’s like a 15 minute discussion and does not introduce anything unnecessary.

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