4clojure/4clojure — pull request #261 by curious-attempt-bunny (2014-09-03 15:55:43+00:00)
Title: Fix problem #47 for contains? behaviour in clojure 1.5

In clojure 1.5.1:

```clojure
user=> (not (contains? '(1 2 4) 4))

IllegalArgumentException contains? not supported on type: clojure.lang.PersistentList clojure.lang.RT.contains (RT.java:724)
```