code: def _validate(self):
          
          if not 0.0 <= self._min_percentile < self._max_percentile <= 100.0:
              raise BadPercentileBounds(
                  min_percentile=self._min_percentile,
                  max_percentile=self._max_percentile,
                  upper_bound=100.0
              )
          return super(PercentileFilter, self)._validate()
docs: Ensure that our percentile bounds are well-formed.