code: func (ns *Namespace) Title(s interface{}) (string, error) {
  	ss, err := cast.ToStringE(s)
  	if err != nil {
  		return "", err
  	}
  
  	return ns.titleFunc(ss), nil
  }
docs: // Title returns a copy of the input s with all Unicode letters that begin words
  // mapped to their title case.