code: func (o *ConfigOpt) String() string {
  	configs := []string{}
  	for _, config := range o.values {
  		repr := fmt.Sprintf("%s -> %s", config.ConfigName, config.File.Name)
  		configs = append(configs, repr)
  	}
  	return strings.Join(configs, ", ")
  }
docs: // String returns a string repr of this option