Correctly handle non-string param values in keyword params middleware.

@@ -3,16 +3,16 @@
 
 (defn- keyify-params [target]
   (cond
-    (string? target)
-      target
     (map? target)
       (reduce
         (fn [m [k v]]
           (assoc m (keyword k) (keyify-params v)))
         {}
         target)
     (vector? target)
-      (vec (map keyify-params target))))
+      (vec (map keyify-params target))
+    :else
+      target))
 
 (defn wrap-keyword-params
   "Middleware that converts the string-keyed :params map to one with keyword

@@ -9,4 +9,6 @@
     {"foo" "bar" "biz" "bat"}
     {:foo  "bar" :biz  "bat"}
     {"foo" "bar" "biz" [{"bat" "one"} {"bat" "two"}]}
-    {:foo  "bar" :biz  [{:bat "one"}  {:bat  "two"}]}))
+    {:foo  "bar" :biz  [{:bat "one"}  {:bat  "two"}]}
+    {"foo" 1}
+    {:foo  1}))