docs: def set_default_value(self, data_id, value=EMPTY, initial_dist=0.0):
          """
          Set the default value of a data node in the dispatcher.
  
          :param data_id:
              Data node id.
          :type data_id: str
  
          :param value:
              Data node default value.
  
              .. note:: If `EMPTY` the previous default value is removed.
          :type value: T, optional
  
          :param initial_dist:
              Initial distance in the ArciDispatch algorithm when the data node
              default value is used.
          :type initial_dist: float, int, optional
  
          :return:
              Self.
          :rtype: BlueDispatcher
          """
          self.deferred.append(('set_default_value', _call_kw(locals())))
          return self