Value messes up type checking for object types

[gene-pauly-byborg]

package;

class Test {
	static function main() {
		//var x:Data = { foo: 1 }; // Error: { foo : Int } has extra field foo
		var x:coconut.data.Value<Data> = { foo: 1 }; // Compiles
	}
}

typedef Data = {
	@:optional var bar:Int;
}

Expected: when using Value, there should be the same "extra field" error as when using the plain type.