The doc string for clojure.core/run! is:
  "Runs the supplied procedure (via reduce), for purposes of side
  effects, on successive items in the collection. Returns nil"

However, it does not necessarily return nil.

e.g.

(run! #(do (println %) %) [1 2])
1
2
;= 2

It just returns whatever the given function returns on the last element of 
coll.  I just found the fact that the doc string explicitly says it returns 
nil to be a little misleading.

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