docs: def decode(self, envelope, session, encoding=None, **kwargs):
  		""" :meth:`.WMessengerOnionCoderLayerProto.decode` method implementation.
  
  		:param envelope: original envelope
  		:param session: original session
  		:param encoding: encoding to use (default is 'utf-8')
  		:param kwargs: additional arguments
  
  		:return: WMessengerTextEnvelope
  		"""
  		message = envelope.message()
  		message = message.decode() if encoding is None else message.decode(encoding)
  		return WMessengerTextEnvelope(message, meta=envelope)