@Override
    public int compareTo(final EffectiveMeta o) {
        // IMPORTANT: compareTo is used for equality checking of items in the equals method of a TreeSet
        return TIME_THEN_ID_COMPARATOR.compare(this, o);
    }
Only to be used as a threshold in {@link NavigableSet#floor(Object)} navigation
where we only care about the effectiveMs.
stroom-meta/stroom-meta-api/src/main/java/stroom/meta/api/EffectiveMeta.java