As Clojure 1.7 is finally released, I tried to wet my feet with 
transducers. 
I tried eduction example from official site http://clojure.org/transducers 
but it's not working:

user=> (def xf (comp (filter odd?) (map inc)))
#'user/xf
user=> (def iter (eduction xf (range 5)))
#'user/iter
user=> (reduce + iter)
ClassCastException clojure.core.Eduction cannot be cast to 
clojure.lang.IReduce 
 clojure.core.protocols/fn--6502 (protocols.clj:75)
;; 6 expected

But

user=> (reduce + 0 iter)
6

So is example wrong or this is a bug?

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