public int compareTo(Object o) {
      return toString().compareTo(o.toString());
    }

    @Override
    public String toString() {
      return "BY_TO_STRING";
    }

    private Object readResolve() {
      return INSTANCE;
    }
  }

  // Always equal is a valid total ordering. And it works for any Object.
  private static final class AlwaysEqual extends Ordering<@Nullable Object>

    @Override
    public int hashCode() {
      return System.identityHashCode(this);
    }

    @Override
    public String toString() {
      return "-\u221e";
    }

    private Object readResolve() {
      return INSTANCE;
    }

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

  /*

    @Override
    public Integer minValue() {
      return Integer.MIN_VALUE;
    }

    @Override
    public Integer maxValue() {
      return Integer.MAX_VALUE;
    }

    private Object readResolve() {
      return INSTANCE;
    }

    @Override
    public String toString() {
      return "DiscreteDomain.integers()";
    }

    protected boolean doEquivalent(Object a, Object b) {
      return a.equals(b);
    }

    @Override
    protected int doHash(Object o) {
      return o.hashCode();
    }

    private Object readResolve() {
      return INSTANCE;
    }

    @GwtIncompatible @J2ktIncompatible private static final long serialVersionUID = 1;
  }

    @Override
    public int hashCode() {
      return System.identityHashCode(this);
    }

    @Override
    public String toString() {
      return "-\u221e";
    }

    private Object readResolve() {
      return INSTANCE;
    }

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

  /*

    public int compareTo(Object o) {
      return toString().compareTo(o.toString());
    }

    @Override
    public String toString() {
      return "BY_TO_STRING";
    }

    private Object readResolve() {
      return INSTANCE;
    }
  }

  // Always equal is a valid total ordering. And it works for any Object.
  private static final class AlwaysEqual extends Ordering<@Nullable Object>

    final ImmutableMultiset<E> multiset;

    EntrySetSerializedForm(ImmutableMultiset<E> multiset) {
      this.multiset = multiset;
    }

        Object readResolve() {
      return multiset.entrySet();
    }
  }

  @GwtIncompatible
  @J2ktIncompatible
  @Override
    Object writeReplace() {
    return new SerializedForm(this);
  }

   */

  /** The number of occurrences of each element. */
  private final transient ConcurrentMap<E, AtomicInteger> countMap;

  /**
   * An instance created in {@link #readObject} to be returned from {@link #readResolve}. This field
   * is used only by those methods, and it is never set in a "normal" instance.
   *
   * <p>This class needs to write deserialized data into fields that are {@code final transient}.

          table.rowKeySet().toArray(),
          table.columnKeySet().toArray(),
          table.values().toArray(),
          cellRowIndices,
          cellColumnIndices);
    }

    Object readResolve() {
      if (cellValues.length == 0) {
        return of();
      }
      if (cellValues.length == 1) {
        return of(rowKeys[0], columnKeys[0], cellValues[0]);
      }

    private final DiscreteDomain<C> domain;

    AsSetSerializedForm(ImmutableList<Range<C>> ranges, DiscreteDomain<C> domain) {
      this.ranges = ranges;
      this.domain = domain;
    }

    Object readResolve() {
      return new ImmutableRangeSet<C>(ranges).asSet(domain);
    }
  }

  /**
   * Returns {@code true} if this immutable range set's implementation contains references to