code: func (c Calendar) formatDateTimeComponentDayOfWeekNarrow(dayOfWeek time.Weekday) string {
  	switch dayOfWeek {
  	case time.Sunday:
  		return c.FormatNames.Days.Narrow.Sun
  	case time.Monday:
  		return c.FormatNames.Days.Narrow.Mon
  	case time.Tuesday:
  		return c.FormatNames.Days.Narrow.Tue
  	case time.Wednesday:
  		return c.FormatNames.Days.Narrow.Wed
  	case time.Thursday:
  		return c.FormatNames.Days.Narrow.Thu
  	case time.Friday:
  		return c.FormatNames.Days.Narrow.Fri
  	case time.Saturday:
  		return c.FormatNames.Days.Narrow.Sat
  	}
  
  	return ""
  }
docs: // formatDateTimeComponentDayOfWeekNarrow renders a super-short day-of-week
  // compontent - not guaranteed to be unique for different days.