when {
        pattern.startsWith("**.") -> {
          // With ** empty prefixes match so exclude the dot from regionMatches().
          val suffixLength = pattern.length - 3
          val prefixLength = hostname.length - suffixLength
          hostname.regionMatches(hostname.length - suffixLength, pattern, 3, suffixLength) &&
            (prefixLength == 0 || hostname[prefixLength - 1] == '.')
        }

   *     Otherwise, the decode failed.
   */
  private fun decodeLabel(
    string: String,
    pos: Int,
    limit: Int,
    result: Buffer,
  ): Boolean {
    if (!string.regionMatches(pos, PREFIX_STRING, 0, 4, ignoreCase = true)) {
      result.writeUtf8(string, pos, limit)
      return true
    }

    var pos = pos + 4 // 'xn--'.size.