{
    "schema" = <
        "strict" = %true;
        "unique_keys" = %false;
    > [
        {
            "type_v3" = "string";
            "required" = %true;
            "name" = "key";
        };
        {
            "type_v3" = {
                "type_name" = "struct";
                "members" = [
                    {
                        "type" = {
                            "type_name" = "optional";
                            "item" = "int32";
                        };
                        "name" = "b";
                    };
                    {
                        "type" = "string";
                        "name" = "a";
                    };
                    {
                        "type" = "string";
                        "name" = "c";
                    };
                ];
            };
            "required" = %true;
            "name" = "subkey";
        };
    ];
}