Error while deserializing when type has excluded fields (support excludes for struct)

@kwdef struct Person
     name::String
     fingers::Int=2
end

StructTypes.excludes(::Type{Human}) = (:fingers,)

In the above example, JSON3.write(Person("John")) returns {"name":"John"} as expected. However when we deserialize, we get Cannot `convert` an object of type Nothing to an object of type Int. Instead of setting fingers to nothing, it should probably call a constructor without fingers so that it sets default value 2?

Reproduce the Person example and trace how StructTypes.excludes(::Type{Human}) is handled during deserialization after JSON3.write omits fingers. Inspect the deserialization path that converts the missing field, then verify that an excluded field uses the constructor's default value rather than converting nothing to Int. Done when the example deserializes successfully with fingers set to 2.