Implementation of a deep cloning method into a Backbone.Collection

CollectionDeepClone.js

var Users = Backbone.Collection.extend({
  clone: function (deep) {
    if (deep) {
      return new this.constructor(_.map(this.models, function (model) {
        return model.clone();
      }));
    };

    return Backbone.Collection.prototype.clone.apply(this);
  }
});