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>

  private static final class SerializedForm<V> implements Serializable {
    final ImmutableMap<?, V> map;

    SerializedForm(ImmutableMap<?, V> map) {
      this.map = map;
    }

        Object readResolve() {
      return map.values();
    }

    @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 EnumMap<K, V> delegate;

    EnumSerializedForm(EnumMap<K, V> delegate) {
      this.delegate = delegate;
    }

    Object readResolve() {
      return new ImmutableEnumMap<>(delegate);
    }

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

    final ImmutableMap<K, V> map;

    EntrySetSerializedForm(ImmutableMap<K, V> map) {
      this.map = map;
    }

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

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

      private final String charsetCanonicalName;

      SerializedForm(Charset charset) {
        this.charsetCanonicalName = charset.name();
      }

      private Object readResolve() {
        return stringFunnel(Charset.forName(charsetCanonicalName));
      }

      private static final long serialVersionUID = 0;
    }
  }

  /**
   * Returns a funnel for integers.
   *

    private final DiscreteDomain<C> domain;

    private SerializedForm(DiscreteDomain<C> domain) {
      this.domain = domain;
    }

    private Object readResolve() {
      return new EmptyContiguousSet<>(domain);
    }

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

  @GwtIncompatible
  @J2ktIncompatible

    @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;
  }

  /*

    private final Map<Class<? extends @NonNull B>, B> backingMap;

    SerializedForm(Map<Class<? extends @NonNull B>, B> backingMap) {
      this.backingMap = backingMap;
    }

    Object readResolve() {
      return create(backingMap);
    }

    private static final long serialVersionUID = 0;
  }

  private static final class SerializedForm<V> implements Serializable {
    final ImmutableMap<?, V> map;

    SerializedForm(ImmutableMap<?, V> map) {
      this.map = map;
    }

        Object readResolve() {
      return map.values();
    }

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