Ember toggle element in an array

What is the Ember way to do the following?

App.IndexController = Ember.Controller.extend({
  actions: {
    change: function(){
      var model = this.get('model');
      model[0] = true;
      this.set('model', model);
    }
  }
});

I want to toggle an element (index 0 in this example) in model.

Here is the jsbin: http://ift.tt/1DwUXuh