docs: def _process(self, envelope, session, mode, **kwargs):
  		""" :meth:`.WMessengerOnionLayerProto.process` implementation
  		"""
  		if mode == WMessengerOnionCoderLayerProto.Mode.encode:
  			return self.encode(envelope, session, **kwargs)
  		else:  # mode == WMessengerOnionCoderLayerProto.Mode.decode
  			return self.decode(envelope, session, **kwargs)