protected override void DeserializeMembers(ReadOnlySpan <byte> source, Order instance)
{
instance.Id = Fmt.DeserializeStructDefault <int>(source);
instance.CustomerId = Fmt.DeserializeStructDefault <int>(source);
// we ignore itemnsIsNull here as our class does not allow a null LineItems property
Fmt.DeserializeObjects <LineItem>(source, (item) => instance.LineItems.Add(item), out bool itemsIsNull);
}
