Thanks to Laszlo Török, ClojureScript now has PersistentVectors,
https://github.com/clojure/clojurescript/commit/e615f4cd326e7c608050272c64c4dfaff9a34689
.

They are based on the Java implementations found in Clojure. I'm happy to
say they thoroughly trounce the old copy-on-write Vectors:

http://jsperf.com/persistentvector-norecur-js/11

Note how much room for improvement we have on JS engines like V8 :)

David

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