docs: def unpack_close(self):
          """
          Unpack a close message into a status code and a reason. If no payload
          is given, the code is None and the reason is an empty string.
          """
          if self.payload:
              code = struct.unpack('!H', str(self.payload[:2]))[0]
              reason = str(self.payload[2:])
          else:
              code = None
              reason = ''
  
          return code, reason