lazyseqs_vs_lists.clj

(class (repeat 1))
; clojure.lang.LazySeq

(ancestors clojure.lang.LazySeq)
; #{clojure.lang.IPersistentCollection clojure.lang.IPending java.util.Collection 
; java.util.List clojure.lang.Obj clojure.lang.ISeq clojure.lang.IMeta java.io.Serializable
; clojure.lang.IHashEq clojure.lang.IObj clojure.lang.Seqable clojure.lang.Sequential
; java.lang.Iterable java.lang.Object}

(clojure.set/difference (ancestors clojure.lang.PersistentList) (ancestors clojure.lang.LazySeq))
; #{clojure.lang.Counted clojure.lang.IReduce clojure.lang.IPersistentStack clojure.lang.IPersistentList
; clojure.lang.ASeq}

(clojure.set/difference (ancestors clojure.lang.LazySeq) (ancestors clojure.lang.PersistentList))
; #{clojure.lang.IPending}