code: func iso88591ToUTF8(s []byte) []byte {
  	runes := make([]rune, len(s))
  	for i := range s {
  		runes[i] = rune(s[i])
  	}
  	return []byte(string(runes))
  }
docs: // Convert an ISO-8859-1 encoded byte string to UTF-8. Works by the
  // principle that ISO-8859-1 bytes are equivalent to unicode code points,
  // that a rune slice is a list of code points, and that stringifying a slice
  // of runes generates UTF-8 in Go.