docs: function getDateTimeFormats(localeData) {
    function getFormats(data) {
      return removeDuplicates([
        data.short._value || data.short,
        data.medium._value || data.medium,
        data.long._value || data.long,
        data.full._value || data.full
      ]);
    }
  
    const dateFormats = localeData.main('dates/calendars/gregorian/dateFormats');
    const timeFormats = localeData.main('dates/calendars/gregorian/timeFormats');
    const dateTimeFormats = localeData.main('dates/calendars/gregorian/dateTimeFormats');
  
    return [
      getFormats(dateFormats),
      getFormats(timeFormats),
      getFormats(dateTimeFormats)
    ];
  }