How to use the gcovr.configuration.merge_options_and_set_defaults function in gcovr

def main(args=None):
    parser = create_argument_parser()
    cli_options = parser.parse_args(args=args)

    # load the config
    cfg_name = find_config_name(cli_options)
    cfg_options = {}
    if cfg_name is not None:
        with io.open(cfg_name, encoding='UTF-8') as cfg_file:
            cfg_options = parse_config_into_dict(
                parse_config_file(cfg_file, filename=cfg_name))

    options_dict = merge_options_and_set_defaults(
        [cfg_options, cli_options.__dict__])
    options = Options(**options_dict)

    logger = Logger(options.verbose)

    if cli_options.version:
        logger.msg(
            "gcovr {version}\n"
            "\n"
            "{copyright}",
            version=__version__, copyright=COPYRIGHT)
        sys.exit(0)

    if options.html_medium_threshold > options.html_high_threshold:
        logger.error(
            "value of --html-medium-threshold={} should be\n"