Fully iterate over objects, rather than just props

lib/utils/helpers.js

@@ -82,10 +82,10 @@ function iterate(thing, fn, thisVal) {
   }
 
   if (H.isObject(thing)) {
-    Object.keys(thing).forEach(function(key) {
+    for (var key in thing) {
       var value = thing[key];
       fn.call(thisVal, value, key);
-    }, thisVal);
+    }
   }
 
   return [];