docs: def reset(self):
          """
          Reset the internal node traversal state. Must be called prior to visiting future nodes.
  
          :return: None
          """
  
          self._sorted_nodes.clear()
          self._node_to_index.clear()
          self._reached_fixedpoint.clear()
  
          for i, n in enumerate(self.sort_nodes()):
              self._node_to_index[n] = i
              self._sorted_nodes.add(n)