code: func FromStringAndExt(t, ext string) (Type, error) {
  	tp, err := fromString(t)
  	if err != nil {
  		return tp, err
  	}
  	tp.Suffixes = []string{strings.TrimPrefix(ext, ".")}
  	return tp, nil
  }
docs: // FromStringAndExt is same as FromString, but adds the file extension to the type.