use Test2::Tools::Compare qw{ like hash item field in_set DNE bag };

my $o = bless { x => bless ['y'], 'My::Value' }, 'My::Class';


like({ x => ['y'] },
     hash { field a => in_set(DNE(), 'b');
            field x => bag { item in_set('y', 'z') };
     }
);

like $o, hash { field a => in_set(DNE(), 'b');
                field x => [ in_set('y', 'z') ];
         };