Why does (peek (seq [1])) result in: 
ClassCastException clojure.lang.PersistentVector$ChunkedSeq cannot be cast 
to clojure.lang.IPersistentStack  clojure.lang.RT.peek (RT.java:634)

Peek documentation "For a list or queue, same as first, for a vector, same 
as, but much more efficient than, last. If the collection is empty, returns 
nil." implies that there shouldn't be a problem working with vectors.

This works without issue:
(peek [1]) 

This is on Clojure 1.5.1

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