[BUGFIX beta] [fixes #11181, #10343, #9739, #9462, #4919, #4231, #3706,

#5596, #9485, #9492, #5319, #5268, #4831, #5558] Move away from AC/RC instead use the simpler naive enumerable methods, and rely on glimmers stable rendering for efficiency.

For more complex scenarios, custom solutions should be used.

@wagenet & @stefanpenner

packages/ember-metal/lib/mixin.js

@@ -542,8 +542,7 @@ export function mixin(obj, ...args) {
   @namespace Ember
   @public
 */
-export default Mixin;
-function Mixin(args, properties) {
+export default function Mixin(args, properties) {
   this.properties = properties;
 
   var length = args && args.length;