*/
    internal fun StringBuilder.appendQuotedString(key: String) {
      append('"')
      for (i in 0 until key.length) {
        when (val ch = key[i]) {
          '\n' -> append("%0A")
          '\r' -> append("%0D")
          '"' -> append("%22")
          else -> append(ch)
        }
      }
      append('"')
    }
  }