How does Clojure decide which Protocol implementation to call.

I ask because I have tried this code:


(defprotocol Fred
  (fred [item]))

(extend-type CharSequence
  Fred
  (fred [item] "charseq"))

(extend-type Comparable
  Fred
  (fred [item] "comparable"))

(extend-type java.io.Serializable
  Fred
  (fred [item] "serializable"))


(fred "hello")


With lein repl it seems to return charseq everytime. With CIDER it gives
different results. With lein repl on windows, again, different results
with different JVM invocations.

Should this not be consistent?

Phil

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