for (int childIndex = 1; childIndex <= childCount; childIndex++)
{
final A_Tuple child = object.slot(SUBTUPLE_AT_, childIndex);
assert child.treeTupleLevel() == myLevelMinusOne;
assert myLevelMinusOne == 0
<BUG>|| child.childCount() >= minWidthOfNonRoot;
cumulativeSize += child.tupleSize();
assert object.intSlot(CUMULATIVE_SIZES_AREA_, childIndex)</BUG>
== cumulativeSize;
}

for (int childIndex = 1; childIndex <= childCount; childIndex++)
{
result.setIntSlot(
CUMULATIVE_SIZES_AREA_,
childIndex,
result.intSlot(CUMULATIVE_SIZES_AREA_, childIndex) + delta);
