code: func parseUint64Slice(s string) ([]uint64, error) {
  	var a []uint64
  	for _, str := range strings.Split(s, ",") {
  		// Ignore blanks.
  		if str == "" {
  			continue
  		}
  
  		// Parse number.
  		num, err := strconv.ParseUint(str, 10, 64)
  		if err != nil {
  			return nil, errors.Wrap(err, "parsing int")
  		}
  		a = append(a, num)
  	}
  	return a, nil
  }
docs: // parseUint64Slice returns a slice of uint64s from a comma-delimited string.