>> cons is acting according to its documentation.
>
> It's list? that isn't.
That's not strictly true:
user=> (doc list?)
-------------------------
clojure.core/list?
([x])
Returns true if x implements IPersistentList
nil
user=> (cons 5 '(1 2 3))
(5 1 2 3)
user=> (ancestors (type *1))
#{clojure.lang.IMeta java.lang.Iterable java.util.Collection
clojure.lang.ISeq java.util.List clojure.lang.Seqable clojure.lang.Obj
clojure.lang.IObj java.lang.Object clojure.lang.Sequential
clojure.lang.IPersistentCollection clojure.lang.Streamable
clojure.lang.ASeq}
... the result of cons does not implement IPersistentList, so list? is
acting according to its documentation.
Is there a reason why you are testing for listiness rather than for
some other property, like Sequential? It's generally considered good
form in Clojure to program against the native abstractions (such as
sequences) rather than particular concrete types.
-R
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