[enhancement] support non default constructors with non mapped parameters

[TMaddox]

Consider this example:

class Tree
{
        [CborProperty("r")]
        private readonly byte[] _r;

        [CborProperty("s")]
        private readonly byte[] _s;

        [CborConstructor]
        public ECSignature(byte[] r, byte[] s)
        {
            _r = r
            _s = s
        }
}

And this filter approach:

CborOptions.Default.Registry.ObjectMappingRegistry.Register<Tree>(om =>
            {
                om.AutoMap();
                om.ClearMemberMappings();
            });

This will throw right on adding the mapper. I guess this is because there is a [CborConstructor] attribute and there won't be, for example, a "r" or "s" to deserialize, could you just add null, or allow an option to not throw if not all fields can be deserialized?

Or can I use more than one [CborConstructor] and build multiple constructors for each case? (I got different (de)serialization modes and need to be able to serialize one single class in different ways)

[mcatanzariti]

solution here:
https://github.com/dahomey-technologies/Dahomey.Cbor/blob/master/src/Dahomey.Cbor.Tests/Issues/Issue0017.cs