Comment 5 for bug 1476799

@cwayne. when I wrote that part of scope-agg I did not account for a setting of 0 as valid, so like I said, scope agg needs a small fix:
                int cardinality_ = scope_o["cardinality"].toInt();
                if (cardinality_ > 0)
                {
                    cs->cardinality = cardinality_;
                }