boolean hasUpBound = this.hasUpperBound;
    T upEnd = getUpperEndpoint();
    BoundType upType = getUpperBoundType();
    if (!hasUpperBound()) {
      hasUpBound = other.hasUpperBound;
      upEnd = other.getUpperEndpoint();
      upType = other.getUpperBoundType();
    } else if (other.hasUpperBound()) {
      int cmp = comparator.compare(getUpperEndpoint(), other.getUpperEndpoint());

    boolean hasUpBound = this.hasUpperBound;
    T upEnd = getUpperEndpoint();
    BoundType upType = getUpperBoundType();
    if (!hasUpperBound()) {
      hasUpBound = other.hasUpperBound;
      upEnd = other.getUpperEndpoint();
      upType = other.getUpperBoundType();
    } else if (other.hasUpperBound()) {
      int cmp = comparator.compare(getUpperEndpoint(), other.getUpperEndpoint());

    if (node == null) {
      return 0;
    }
    // The cast is safe because we call this method only if hasUpperBound().
    int cmp =
        comparator()
            .compare(uncheckedCastNullableTToT(range.getUpperEndpoint()), node.getElement());
    if (cmp > 0) {
      return aggregateAboveRange(aggr, node.right);
    } else if (cmp == 0) {
      switch (range.getUpperBoundType()) {
        case OPEN: