You can improve your Domain layer using Value Objects instead primitive types to represent data with constraints and other stuff, more about the topic here..
The Value Object implementation was taken from this excellent blog post.
This PoC creates a Social Security Number object and successfully configures EF Core to understand that this should be mapped to a string column in database. It is also able to query objects and deserialize data correctly into the Entities Classes.
However, how one would do very simple query contitions such as LIKE?
This PoC tries to achieve it by implementing the Contains method in the Ssn class, but it doesn't work.
Is there a specific way to instruct EF Core how to evaluate non-primitive types?
Any other suggestions on how this could be achieved? Please feel free to submit PR's or open issues to discuss