* #writeMultiset} for the data format.
   */
  static <E extends @Nullable Object> void populateMultiset(
      Multiset<E> multiset, ObjectInputStream stream) throws IOException, ClassNotFoundException {
    int distinctElements = stream.readInt();
    populateMultiset(multiset, stream, distinctElements);
  }

  /**

   * #writeMultiset} for the data format.
   */
  static <E extends @Nullable Object> void populateMultiset(
      Multiset<E> multiset, ObjectInputStream stream) throws IOException, ClassNotFoundException {
    int distinctElements = stream.readInt();
    populateMultiset(multiset, stream, distinctElements);
  }

  /**

    stream.defaultReadObject();
    int distinctElements = stream.readInt();
    setBackingMap(new HashMap<>());
    Serialization.populateMultiset(this, stream, distinctElements);
  }

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

    stream.defaultReadObject();
    int distinctElements = stream.readInt();
    setBackingMap(new LinkedHashMap<E, Count>());
    Serialization.populateMultiset(this, stream, distinctElements);
  }

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

    stream.defaultReadObject();
    int distinctElements = stream.readInt();
    backingMap = newBackingMap(ObjectCountHashMap.DEFAULT_SIZE);
    Serialization.populateMultiset(this, stream, distinctElements);
  }

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

    Comparator<? super E> comparator = (Comparator<? super E>) requireNonNull(stream.readObject());
    deserializationReplacement = new TreeMultiset<>(comparator);
    Serialization.populateMultiset(deserializationReplacement, stream);
  }

  @J2ktIncompatible
  @GwtIncompatible
    private Object readResolve() {
    return requireNonNull(deserializationReplacement); // set by readObject
  }