code: func ioOutputFormatClassFixed(ld *LineData, b *bytes.Buffer) error {
  	class := strings.ToUpper(ld.Class.String())
  	switch len(class) {
  	case 4:
  		class += " "
  	case 6:
  		class = class[:5]
  	}
  	_, err := b.WriteString(class)
  	return err
  }
docs: // Formatting function used to implement the %classfixed% code.