code: def prioritized_iter(cls, flag_val, env_val, config_val, config_default_val,
                         hardcoded_val, default):
      
      if flag_val is not None:
        yield RankedValue(cls.FLAG, flag_val)
      if env_val is not None:
        yield RankedValue(cls.ENVIRONMENT, env_val)
      if config_val is not None:
        yield RankedValue(cls.CONFIG, config_val)
      if config_default_val is not None:
        yield RankedValue(cls.CONFIG_DEFAULT, config_default_val)
      if hardcoded_val is not None:
        yield RankedValue(cls.HARDCODED, hardcoded_val)
      yield RankedValue(cls.NONE, default)
docs: Yield the non-None values from highest-ranked to lowest, wrapped in RankedValue instances.