pub type RowValEnter<V, T, R, TEnter> = TraceEnter<TraceFrontier<TraceAgent<Spine<Rc<OrdValBatch<RowValLayout<((Row, V), T, R)>>>, ColumnatedMergeBatcher<Row, V, T, R>, RcBuilder<OrdValBuilder<RowValLayout<((Row, V), T, R)>>>>>>, TEnter>;
struct RowValEnter<V, T, R, TEnter> {
trace: TraceFrontier<TraceAgent<Spine<Rc<OrdValBatch<RowValLayout<((Row, V), T, R)>>>, ColumnatedMergeBatcher<Row, V, T, R>, RcBuilder<OrdValBuilder<RowValLayout<((Row, V), T, R)>>>>>>,
stash1: Antichain<<TraceFrontier<TraceAgent<Spine<Rc<OrdValBatch<RowValLayout<((Row, V), T, R)>>>, ColumnatedMergeBatcher<Row, V, T, R>, RcBuilder<OrdValBuilder<RowValLayout<((Row, V), T, R)>>>>>> as TraceReader>::Time>,
stash2: Antichain<TEnter>,
}