docs: function fireEvent ( eventName, handleNumber, tap ) {
  
              Object.keys(scope_Events).forEach(function( targetEvent ) {
  
                  var eventType = targetEvent.split('.')[0];
  
                  if ( eventName === eventType ) {
                      scope_Events[targetEvent].forEach(function( callback ) {
  
                          callback.call(
                              // Use the slider public API as the scope ('this')
                              scope_Self,
                              // Return values as array, so arg_1[arg_2] is always valid.
                              scope_Values.map(options.format.to),
                              // Handle index, 0 or 1
                              handleNumber,
                              // Unformatted slider values
                              scope_Values.slice(),
                              // Event is fired by tap, true or false
                              tap || false,
                              // Left offset of the handle, in relation to the slider
                              scope_Locations.slice()
                          );
                      });
                  }
              });
          }