code: func Copy(dst, src *Locale) {
  	if src.Locale != "" {
  		dst.Locale = src.Locale
  	}
  	if src.PluralRule != "" {
  		dst.PluralRule = src.PluralRule
  	}
  	// Calendar   Calendar
  
  	copyNumber(&dst.Number, &src.Number)
  	copyCalendar(&dst.Calendar, &src.Calendar)
  }
docs: // Copy only override dst value if src value is not a zero value
  //
  // TODO: write a auto generator