I was looking at a commit that updated a docstring for str/join, which
enticed me to take a look at the implementation.  I was kind of
surprised to see that it wasn't:
  (apply str (interpose sep coll))

I'm just curious about the developer was thinking.  Here's a link to the code:
  
<https://github.com/clojure/clojure/blob/f30995c86056959abca53d0ca35dcb9cfa73e6e6/src/clj/clojure/string.clj#L130>

Thanks!

-John

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