@SuppressWarnings("RedundantOverride")
            @Override
            @J2ktIncompatible
            @GwtIncompatible
                        Object writeReplace() {
              return super.writeReplace();
            }
          };
      return new CartesianSet<E>(axes, new CartesianList<E>(listAxes));
    }

    @Override
    public void clear() {
      MapMakerInternalMap.this.clear();
    }
  }

  // Serialization Support

  private static final long serialVersionUID = 5;

  Object writeReplace() {
    return new SerializationProxy<>(
        entryHelper.keyStrength(),
        entryHelper.valueStrength(),
        keyEquivalence,
        entryHelper.valueStrength().defaultEquivalence(),