code: func (ns *Namespace) RuneCount(s interface{}) (int, error) {
  	ss, err := cast.ToStringE(s)
  	if err != nil {
  		return 0, _errors.Wrap(err, "Failed to convert content to string")
  	}
  	return utf8.RuneCountInString(ss), nil
  }
docs: // RuneCount returns the number of runes in s.