add missing file

src/clj/com/rpl/specter/defnavhelpers.cljx

@@ -0,0 +1,14 @@
+(ns com.rpl.specter.defnavhelpers
+  (:require [com.rpl.specter.impl :as i]))
+
+(defn param-delta [i]
+  (fn [^objects params params-idx]
+    (aget params (+ params-idx i))
+    ))
+
+(defn bound-params [path start-delta]
+  (fn [^objects params params-idx]
+    (if (i/params-needed-path? path)
+      (i/bind-params* path params (+ params-idx start-delta))
+      path
+      )))