code: function _ensureModel(model) {
        if (model instanceof this.model) {
          return model;
        } else if (typeof model === "object") {
          return new this.model(model);
        } else {
          return new this.model({ id: model });
        }
      }
docs: Ensure that we have a real model from an id, object, or model.
  
  @private
  @instance
  @method _ensureModel
  @memberOf Storage
  @params {Number|String|Object|Backbone.Model} - An id, object, or model.
  @returns {Backbone.Model} - The model.