code: function (event, preferenceID, handler) {
              if (typeof preferenceID === "function") {
                  handler = preferenceID;
                  preferenceID = null;
              }
  
              if (preferenceID) {
                  var pref = this.getPreference(preferenceID);
                  pref.off(event, handler);
              } else {
                  this._off_internal(event, handler);
              }
          }
docs: Turns off the event handlers for a given event, optionally for a specific preference
  or a specific handler function.
  
  @param {string} event Name of the event for which to turn off listening
  @param {string|Function} preferenceID Name of a specific preference or the handler function
  @param {?Function} handler Specific handler which should stop being notified