docs: function getWeekendRange(localeData) {
    const startDay =
      localeData.get(`supplemental/weekData/weekendStart/${localeData.attributes.territory}`) ||
      localeData.get('supplemental/weekData/weekendStart/001');
    const endDay =
      localeData.get(`supplemental/weekData/weekendEnd/${localeData.attributes.territory}`) ||
      localeData.get('supplemental/weekData/weekendEnd/001');
    return [WEEK_DAYS.indexOf(startDay), WEEK_DAYS.indexOf(endDay)];
  }