code: def FoldByteStream(self, mapped_value, **unused_kwargs):  # pylint: disable=redundant-returns-doc
      
      raise errors.FoldingError(
          'Unable to fold {0:s} data type into byte stream'.format(
              self._data_type_definition.TYPE_INDICATOR))
docs: Folds the data type into a byte stream.
  
      Args:
        mapped_value (object): mapped value.
  
      Returns:
        bytes: byte stream.
  
      Raises:
        FoldingError: if the data type definition cannot be folded into
            the byte stream.