Of course, lazy Clojure functions like "concat" end up basically doing this:

(def q (concat '(1 2 3) '(4)))

      q
      |
      |
      V
[lazy-concat]
    |      |
    V      V
'(1 2 3) '(4)

The result of a lot of concats ends up therefore being a tree
structure under the hood. It can be flattened with doall.

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