code: func (m *MapStringBool) String() string {
  	if m == nil || m.Map == nil {
  		return ""
  	}
  	pairs := []string{}
  	for k, v := range *m.Map {
  		pairs = append(pairs, fmt.Sprintf("%s=%t", k, v))
  	}
  	sort.Strings(pairs)
  	return strings.Join(pairs, ",")
  }
docs: // String implements github.com/spf13/pflag.Value