Github user zkendall commented on the pull request:
https://github.com/apache/storm/commit/fd42a28edc2d8bfd608d6283106311809e135acc#commitcomment-17071923
One consideration is [bit-xor contains `reduce` inside it
already](https://github.com/clojure/clojure/blob/clojure-1.7.0/src/clj/clojure/core.clj#L1276).
So maybe removing your own reduce in the closure would have helped.
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