Abstract types serialization with `type` keys

[sairus7]

This example works only in one way - type key is lost trying to convert back to Dict:

abstract type Vehicle end
struct Car <: Vehicle; make::String; model::String; end
struct Truck <: Vehicle; make::String; model::String; payload::Float64; end

# Define how to choose concrete types based on source data
StructUtils.@choosetype Vehicle x -> x["type"] == "car" ? Car : Truck

# Now make can create the right type
car = StructUtils.make(Vehicle, Dict("type" => "car", "make" => "Toyota", "model" => "Corolla"))

StructUtils.make(Dict, car) # no type key

What is the recommended way to make type field working both ways?
Should we always define @nonstruct with custom lift/lower methods?