public Zones(Func <ValueTask <IShape> > zoneFactory, ZoneHolding parent)
{
_zoneFactory = zoneFactory;
_parent = parent;
}
public ZoneOnDemand(Func <ValueTask <IShape> > zoneFactory, ZoneHolding parent, string potentialZoneName)
{
_zoneFactory = zoneFactory;
_parent = parent;
_potentialZoneName = potentialZoneName;
}