private byte[] serialise(final List<String> values) {
        final byte[] bytes;
        try (final Output output = new Output(512, -1)) {
            for (final String value : values) {
                output.writeString(value);
            }
            bytes = output.toBytes();
        }
        return bytes;
    }
Allow this to be overridden for testing with a simpler hash algo
stroom-analytics/stroom-analytics-impl/src/main/java/stroom/analytics/impl/DuplicateCheckRowSerde.java