@Override
public void retain(int itemCount) {
accu[0] = accu[0].mergeWith(a.checkRetain(itemCount, v));
abortIfIllFormed();
a.doRetain(itemCount);
}
@Override
public void updateAttributes(AttributesUpdate u) {
accu[0] = accu[0].mergeWith(a.checkUpdateAttributes(u, v));