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/gist:4655172
Created Jan 28, 2013

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(defn fold-vec-maps-into-map [coll]
"Provided a reducer, concatenate into a vector.
Note: same as (into [] coll), but parallel."
(let [merge-fn (partial merge-with into)]
(r/fold (r/monoid merge-fn hash-map) merge-fn coll)))
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