code: protected boolean standardSetCount(E element, int oldCount, int newCount) {
      return Multisets.setCountImpl(this, element, oldCount, newCount);
    }
docs: A sensible definition of {@link #setCount(Object, int, int)} in terms of {@link #count(Object)}
  and {@link #setCount(Object, int)}. If you override either of these methods, you may wish to
  override {@link #setCount(Object, int, int)} to forward to this implementation.
  
  @since 7.0