docs: def _get_dataruns(self):
          '''Returns a list of dataruns, in order.
          '''
          if self._data_runs is None:
              raise DataStreamError("Resident datastream don't have dataruns")
  
          if not self._data_runs_sorted:
              self._data_runs.sort(key=_itemgetter(0))
              self._data_runs_sorted = True
  
          return [data[1] for data in self._data_runs]