Could someone give me a simple example of when
clojure.contrib.accumulators is useful? Its use seems to involve
collections (and numbers) that have the :clojure.contrib.accumulators/
accumulator type, and it has some general multimethods for adding and
combining, but what does it add that conj and concat do not provide?
contrib.monads/writer-m seems to suggest using accumulators, too...
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