code: def dump(self, force=False):
          
  
          contents = b''
          for child in self._children:
              contents += child.dump(force=force)
          return contents
docs: Encodes the value using DER
  
          :param force:
              If the encoded contents already exist, clear them and regenerate
              to ensure they are in DER format instead of BER format
  
          :return:
              A byte string of the DER-encoded value