@Override
        public boolean equals(Object other) {
            if (this == other) return true;
            if (!(other instanceof UcaSorter)) return false;
            return super.equals(other) && locale.equals(((UcaSorter)other).locale) && (strength == ((UcaSorter)other).strength);
        }
Returns the serial form of this which contains all information needed to reconstruct this sorter
container-search/src/main/java/com/yahoo/search/query/Sorting.java