* #writeMultimap} for the data format.
   */
  static <K extends @Nullable Object, V extends @Nullable Object> void populateMultimap(
      Multimap<K, V> multimap, ObjectInputStream stream)
      throws IOException, ClassNotFoundException {
    int distinctKeys = stream.readInt();
    populateMultimap(multimap, stream, distinctKeys);
  }

  /**

    stream.defaultReadObject();
    expectedValuesPerKey = DEFAULT_VALUES_PER_KEY;
    int distinctKeys = stream.readInt();
    Map<K, Collection<V>> map = new HashMap<>();
    setMap(map);
    Serialization.populateMultimap(this, stream, distinctKeys);
  }

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