Registry suggestion

Registry.cs

        public static IAction Deserialize(Bencodex.Types.Dictionary serialized)
        {
            if (!serialized.TryGetValue((Text)"type_id", out IValue typeIdValue))
            {
                throw new ArgumentException("No type_id field found.", nameof(serialized));
            }

            if (!serialized.TryGetValue((Text)"values", out IValue values))
            {
                throw new ArgumentException("No values field found.", nameof(serialized));
            }

            if (!(typeIdValue is Bencodex.Types.Integer typeIdInt))
            {
                throw new ArgumentException(
                    "type_id field is not an integer.",
                    nameof(serialized)
                );
            }

            var typeId = (TypeId)(short)typeIdInt;
            Type actionType = Instantiate(typeId);
            var actionObject = Activator.CreateInstance(actionType, new List().Add(values));
            if (actionObject is IAction action)
            {
                return action;
            }

            throw new ArgumentException(
                "Cannot initialize action.",
                nameof(serialized)
            );
        }
        
        private static Type Instantiate(TypeId typeId) =>
            typeId switch
            {
                TypeId.Mint => typeof(Mint),
                TypeId.Transfer => typeof(Transfer),
                _ => throw new ArgumentOutOfRangeException(
                    nameof(typeId),
                    typeId,
                    "Unknown system type ID."
                ),
            };