code: function(aliasOrModel) {
        var model,
          alias = this.__findAlias(aliasOrModel);
        if (alias) {
          model = this.__currentObjectModels[alias];
          delete this.__currentObjectModels[alias];
          this.__updateCache(model);
        }
        this.resetUpdating();
      }
docs: Removes the binding between a model alias and a model instance. Effectively stops tracking that model.
  @method untrackModel
  @param aliasOrModel {String or Backbone Model instance} If a string is given, it will unset the model using that alias. If a model instance
  is given, it will unbind whatever alias is currently bound to it.