private byte[] rawTimestamp(final byte[] data) {
        final byte[] rawTimestamp = new byte[8];
        System.arraycopy(data, 0, rawTimestamp, 0, 8);
        return rawTimestamp;
    }
The deserializer that is used for {@link TimestampedKeyAndJoinSide}, which is a combo key format of <timestamp, left/right flag, raw-key>
@param <K> the raw key type
streams/src/main/java/org/apache/kafka/streams/state/internals/TimestampedKeyAndJoinSideDeserializer.java