func (m *MessageThreshold) Type() string {
	return "Level"
}

// Set is a function declared in the pflag.Value interface
func (m *MessageThreshold) Set(s string) error {
	levelMap := diag.GetUppercaseStringToLevelMap()
	level, ok := levelMap[strings.ToUpper(s)]
	if !ok {
		return errors.New("invalid level option")
	}
	m.Level = level
	return nil

L1:[Level] and [LevelVar] now implement the [encoding.TextAppender] interface.
...

pkg net/url, method (*URL) AppendBinary([]uint8) ([]uint8, error) #62384
pkg log/slog, method (Level) AppendText([]uint8) ([]uint8, error) #62384
pkg log/slog, method (*LevelVar) AppendText([]uint8) ([]uint8, error) #62384
pkg math/big, method (*Float) AppendText([]uint8) ([]uint8, error) #62384
pkg math/big, method (*Int) AppendText([]uint8) ([]uint8, error) #62384