code: def set_options(self, multiplex_first=True, **bogus_options):
          "Takes implementation specific options. To be overriden in a subclass."
          self.multiplex_first = multiplex_first
          self._warn_bogus_options(**bogus_optionsf set_options(self, multiplex_first=True, **bogus_options):
          "Takes implementation specific options. To be overriden in a subclass."
          self.multiplex_first = multiplex_first
          self._warn_bogus_options(**bogus_options)
docs: Takes implementation specific options. To be overriden in a subclass.