In Clojure 1.6.0, *range* returned a LazySeq, which could be tested with 
*realized?*.  In Clojure 1.7.0 and 1.8.0-alpha3, it returns an Iterate, a 
Range, or a LongRange*. *  realized? only works with the first of these 
three.  For example: 

Clojure 1.6.0:

user=> (class (range 5))
clojure.lang.LazySeq
user=> (realized? (range 5))
false

Clojure 1.7.0:

user=> (class (range))
clojure.lang.Iterate
user=> (realized? (range))
true
user=> (class (range 5))
clojure.lang.LongRange
user=> (realized? (range 5))
ClassCastException clojure.lang.LongRange cannot be cast to 
clojure.lang.IPending  clojure.core/realized? (core.clj:7228)

Is this intended behavior, or a bug?  Is there another predicate that 
should be used now to test whether ranges are realized?

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