* {@code ImmutableMap.Builder}.
     *
     * @since 31.1
     */
    public ImmutableMap<K, V> buildKeepingLast() {
      return build(false);
    }

    @VisibleForTesting // only for testing JDK backed implementation
    ImmutableMap<K, V> buildJdkBacked() {
      checkState(
          valueComparator == null, "buildJdkBacked is only for testing; can't use valueComparator");
      switch (size) {
        case 0:

 *
 * <p><b>Important note:</b> Unlike {@code InetAddress.getByName()}, the methods of this class never
 * cause DNS services to be accessed. For this reason, you should prefer these methods as much as
 * possible over their JDK equivalents whenever you are expecting to handle only IP address string
 * literals -- there is no blocking DNS penalty for a malformed string.
 *

          // RI response to the FAIL_HANDSHAKE
        }
        is SSLHandshakeException -> {
          // Android's response to the FAIL_HANDSHAKE
        }
        is SSLException -> {
          // JDK 1.9 response to the FAIL_HANDSHAKE
          // javax.net.ssl.SSLException: Unexpected handshake message: client_hello
        }
        is SocketException -> {
          // Conscrypt's response to the FAIL_HANDSHAKE