public virtual OnPropertyNullableChangedNode VisitOnPropertyNullableChanged(OnPropertyNullableChangedNode node) => node;
 public override OnPropertyNullableChangedNode VisitOnPropertyNullableChanged(OnPropertyNullableChangedNode node)
 {
     Dispatcher._immediateConventionScope.OnPropertyNullableChanged(node.PropertyBuilder);
     return(null);
 }