public vValue SectionVal(vDescriptor i, vDescriptor j) { return Section(i, j).Deref(); }
public vValue SectionVal(vDescriptor i, vDescriptor j) { vDescriptor x = this.Section(i, j); return (x != null) ? x.Deref() : null; }
public vValue SectionVal(vDescriptor i, vDescriptor j)		      // .x[i:j]					{ return Section(i, j).Deref(); }