* If the map contains a language key, it will be sorted to appear first.
     *
     * @return a set view of the mappings contained in this map with language key prioritized
     */
    @Override
    public Set<java.util.Map.Entry<String, Object>> entrySet() {
        if (parent.containsKey(LANG_KEY)) {

 * java.util.LinkedHashSet}. Generally speaking, this class reduces object allocation and memory
 * consumption at the price of moderately increased constant factors of CPU. Only use this class
 * when there is a specific reason to prioritize memory over CPU.
 *
 * @author Louis Wasserman
 */
@GwtIncompatible // not worth using in GWT for now
final class CompactLinkedHashSet<E extends @Nullable Object> extends CompactHashSet<E> {