code: func WordSepNormalizeFunc(f *pflag.FlagSet, name string) pflag.NormalizedName {
  	if strings.Contains(name, "_") {
  		return pflag.NormalizedName(strings.Replace(name, "_", "-", -1))
  	}
  	return pflag.NormalizedName(name)
  }
docs: // WordSepNormalizeFunc changes all flags that contain "_" separators