Clojure zippers problem

(ns clojure.zip.tests
  (:use clojure.test)
  (:require [clojure.zip :as zip]))


(def vecdat [[[1 2 3] [4 [5 6] 7] [8 9]]])
(def veczip (zip/vector-zip vecdat))

(def  seqdat (list (list 1 2 3) (list 4 (list 5 6) 7) (list 8 9)))
(def  seqzip (zip/seq-zip seqdat))

(deftest seqveczip
  (testing "it seems seq and vector zippers not behaving the same way"
    (is (= (-> veczip zip/down zip/down zip/node)
           (-> seqzip zip/down zip/node))