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The document discusses Clojure 1.5, noting that it includes reducers which provide map, filter, and reduce functions that use the fork/join framework for fast performance. Reducers allow processing large datasets in parallel. The document also mentions Rich Hickey, FP, immutability, functions and data as part of the Clojure way. It provides a link to the Clojure 1.5 changelog on GitHub.Read less