docs: function bindEvent ( namespacedEvent, callback ) {
              scope_Events[namespacedEvent] = scope_Events[namespacedEvent] || [];
              scope_Events[namespacedEvent].push(callback);
  
              // If the event bound is 'update,' fire it immediately for all handles.
              if ( namespacedEvent.split('.')[0] === 'update' ) {
                  scope_Handles.forEach(function(a, index){
                      fireEvent('update', index);
                  });
              }
          }