add simple-vector for now, might need to compiler support soon, but can use this util then

Author: swannodette

src/main/cljs/cljs/core.cljs

@@ -12322,6 +12322,12 @@ reduces them without incurring seq initialization"
 
 (set! (. Vector -fromArray) (fn [xs] (Vector. nil xs nil)))
 
+(defn simple-vector
+  [& args]
+  (if (and (instance? IndexedSeq args) (zero? (.-i args)))
+    (.fromArray Vector (.-arr args) (not (array? (.-arr args))))
+    (vec args)))
+
 ; The keys field is an array of all keys of this map, in no particular
 ; order. Any string, keyword, or symbol key is used as a property name
 ; to store the value in strobj.  If a key is assoc'ed when that same