@@ -4668,7 +4668,7 @@ reduces them without incurring seq initialization"
 {:added "1.2"
 :static true}
 ([m ks]
-(get-in m ks nil))
+(reduce get m ks))
 ([m ks not-found]
 (loop [sentinel lookup-sentinel
 m m

@@ -3111,6 +3111,15 @@
 (deftest test-cljs-1569
 (is (= (meta (with-meta (seq [1 2 3]) {:a 1})) {:a 1})))
 
+(deftest test-cljs-1420
+(is (= :2-arity
+(get-in
+(reify
+ILookup
+(-lookup [o k] :2-arity)
+(-lookup [o k not-found] :3-arity))
+[:foo]))))
+
 
 (comment
 ;; ObjMap