* just back this out once we stop doing that (which we'll do after our internal GWT setup
   * changes).
   */
  @Override
  public ImmutableMap<Object, Collection<Object>> asMap() {
    return super.asMap();
  }

  private Object readResolve() {
    return INSTANCE; // preserve singleton property
  }

  @GwtIncompatible @J2ktIncompatible private static final long serialVersionUID = 0;

    extends AbstractSortedSetMultimap<K, V> {

  AbstractSortedKeySortedSetMultimap(SortedMap<K, Collection<V>> map) {
    super(map);
  }

  @Override
  public SortedMap<K, Collection<V>> asMap() {
    return (SortedMap<K, Collection<V>>) super.asMap();
  }

  @Override
  SortedMap<K, Collection<V>> backingMap() {
    return (SortedMap<K, Collection<V>>) super.backingMap();
  }

  @Override
  public SortedSet<K> keySet() {

        assertFalse(newParams.containsKey("key4"));
    }

    // Test asMap
    public void test_asMap() {
        dataStoreParams.put("key1", "value1");
        dataStoreParams.put("key2", 123);
        dataStoreParams.put("key3", null);

        Map<String, Object> map = dataStoreParams.asMap();

        assertNotNull(map);
        assertEquals(3, map.size());

          ImmutableMap<Range<Integer>, Integer> asMap = rangeMap.asMapOfRanges();
          ImmutableMap<Range<Integer>, Integer> descendingMap = rangeMap.asDescendingMapOfRanges();
          assertEquals(expectedAsMap, asMap);
          assertEquals(expectedAsMap, descendingMap);
          SerializableTester.reserializeAndAssert(asMap);
          SerializableTester.reserializeAndAssert(descendingMap);

  static <K extends @Nullable Object, V extends @Nullable Object> void writeMultimap(
      Multimap<K, V> multimap, ObjectOutputStream stream) throws IOException {
    stream.writeInt(multimap.asMap().size());
    for (Map.Entry<K, Collection<V>> entry : multimap.asMap().entrySet()) {
      stream.writeObject(entry.getKey());
      stream.writeInt(entry.getValue().size());
      for (V value : entry.getValue()) {
        stream.writeObject(value);

    assertEquals(
        Collections.reverseOrder(), ((ImmutableSortedSet<Integer>) multimap.get("x")).comparator());
    assertTrue(multimap.asMap().get("a") instanceof ImmutableSortedSet);
    assertEquals(
        Collections.reverseOrder(),
        ((ImmutableSortedSet<Integer>) multimap.asMap().get("a")).comparator());
  }

  public void testBuilderOrderKeysAndValuesBy() {

    assertEquals(
        Collections.reverseOrder(), ((ImmutableSortedSet<Integer>) multimap.get("x")).comparator());
    assertTrue(multimap.asMap().get("a") instanceof ImmutableSortedSet);
    assertEquals(
        Collections.reverseOrder(),
        ((ImmutableSortedSet<Integer>) multimap.asMap().get("a")).comparator());
  }

  public void testBuilderOrderKeysAndValuesBy() {

    cache.asMap().put(extraKey, extraKey);
    assertSame(extraKey, cache.asMap().get(extraKey));

    Object[] lookupKeys = new Object[] {new Object(), new Object(), new Object()};
    assertThrows(InvalidCacheLoadException.class, () -> cache.getAll(asList(lookupKeys)));

    for (Object key : lookupKeys) {
      assertTrue(cache.asMap().containsKey(key));
    }

    Object three = new Object();
    cache.getUnchecked(three);
    assertEquals(1, cache.stats().hitCount());
    assertEquals(3, cache.stats().missCount());
  }

  // asMap tests

  public void testAsMap() {
    CacheBuilder<Object, Object> builder = createCacheBuilder();
    LocalLoadingCache<Object, Object> cache = makeCache(builder, identityLoader());

      assertTrue(multimap.containsEntry(entry.getKey(), entry.getValue()));
      size++;
    }
    assertEquals(expectedSize, size);

    int size2 = 0;
    for (Entry<K, Collection<V>> entry2 : multimap.asMap().entrySet()) {
      size2 += entry2.getValue().size();
    }
    assertEquals(expectedSize, size2);
  }

  @CollectionSize.Require(ZERO)
  public void testIsEmptyYes() {
    assertTrue(multimap().isEmpty());