Mapping configuration does not support init

[richardluinfo]

Hi Tim,

Thanks a lot for providing the support to nested facets feature. There is another challenge we are facing when trying to configure custom mapping.

Basically static abstract void Map(TSource source, TTarget target); does not seem to support immutable properties using init.

For example, the below

public record Person
{
    public required string FirstName { get; init; }
    public required string LastName { get; init; }
}

[Facet(typeof(Person), Configuration = typeof(PersonMapper))]
public partial record PersonDto
{
    public string FullName { get; init; } = string.Empty;
}

public class PersonMapper : IFacetMapConfiguration<Person, PersonDto>
{
    public static void Map(Person source, PersonDto target)
    {
        target = target with
        {
            FullName = $"{source.FirstName} {source.LastName}"
        };
    }
}

Would you consider to extend the interface to support the Map method with return value? It could be something like this:

public class PersonMapper : IFacetMapConfiguration<Person, PersonDto>
{
    public static void Map(Person source, PersonDto target)
    {
    }
    
    public static PersonDto MapTo(Person source, PersonDto target)
    {
        return target with
        {
            FullName = $"{source.FirstName} {source.LastName}"
        };
    }
}