code: public static CalendarDays of(long days) {
  
          return ((days == 0) ? CalendarDays.ZERO : ((days == 1) ? CalendarDays.ONE : new CalendarDays(days)));
  
      }
docs: /*[deutsch]
  <p>Kapselt die angegebenen Kalendertage als Objekt. </p>
  
  @param   days    count of calendar days
  @return  new or cached instance of {@code CalendarDays}
  @since   3.4/4.3