docs: def unmarshall(values):
      """
      Transform a response payload from DynamoDB to a native dict
  
      :param dict values: The response payload from DynamoDB
      :rtype: dict
      :raises ValueError: if an unsupported type code is encountered
  
      """
      unmarshalled = {}
      for key in values:
          unmarshalled[key] = _unmarshall_dict(values[key])
      return unmarshalled