is($skv->replace_values($dead, $cafe), 1, 'replaced one by value');
is($skv->get($cafe), $cafe, 'value updated');
is($skv->replace_values($dead, $cafe), 0, 'replaced none by value');
is($skv->replace_values($dead, $cafe), 1, 'replaced one by value');
is($skv->get($cafe), $cafe, 'value updated');
is($skv->replace_values($dead, $cafe), 0, 'replaced none by value');