docs: def _sliced_list(self, selector):
          """For slice selectors operating on lists, we need to handle them
          differently, depending on ``skipmissing``. In explicit mode, we may have
          to expand the list with ``default`` values.
          """
          if self.skipmissing:
              return self.obj[selector]
  
          # TODO: can be optimized by observing list bounds
          keys = xrange(selector.start or 0,
                        selector.stop or sys.maxint,
                        selector.step or 1)
          res = []
          for key in keys:
              self._append(self.obj, key, res, skipmissing=False)
          return res