@Override
    public void configure(final Map<String, ?> configs, final boolean isKey) {
        keyDeserializer.configure(configs, isKey);
    }
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