App = Ember.Application.create({});
App.my_list = Ember.ArrayProxy.create({
content: ['dog', 'cat', 'fish']
});
console.log(App.my_list.length); // don't work
console.log(App.my_list.get('length')); // Work
console.log(App.my_list.objectAtContent(0)); // => Work
console.log(App.my_list[0]); // => not work !
console.log(App.my_list.get('0')); // => not work !
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