* elements without being resized. Also, if we've already built a collection backed by the
     * current array, create a new array.
     */
    private void getReadyToExpandTo(int minCapacity) {
      if (contents.length < minCapacity) {
        this.contents =
            Arrays.copyOf(this.contents, expandedCapacity(contents.length, minCapacity));
        forceCopy = false;

    public Builder() {
      this(DEFAULT_INITIAL_CAPACITY);
    }

    Builder(int capacity) {
      this.contents = new @Nullable Object[capacity];
      this.size = 0;
    }

    private void getReadyToExpandTo(int minCapacity) {
      if (contents.length < minCapacity) {
        this.contents = Arrays.copyOf(contents, expandedCapacity(contents.length, minCapacity));
        forceCopy = false;
      } else if (forceCopy) {