docs: def _to_dict(self):
          """Return a json dictionary representing this model."""
          _dict = {}
          if hasattr(self, 'min') and self.min is not None:
              _dict['min'] = self.min
          if hasattr(self, 'max') and self.max is not None:
              _dict['max'] = self.max
          if hasattr(self, 'score') and self.score is not None:
              _dict['score'] = self.score
          return _dict