docs: private YearInfo getYearInfo(int year) {
          YearInfo info = iYearInfoCache[year & CACHE_MASK];
          if (info == null || info.iYear != year) {
              info = new YearInfo(year, calculateFirstDayOfYearMillis(year));
              iYearInfoCache[year & CACHE_MASK] = info;
          }
          return info;
      }