docs: def hash(self):
          """Return checksum to identify pages in same series."""
          return hash(
              self._shape + (
                  self.tilewidth, self.tilelength, self.tiledepth,
                  self.bitspersample, self.fillorder, self.predictor,
                  self.extrasamples, self.photometric, self.compression,
                  self.planarconfig))