tag->setDefault for multiselect checkbox really?

tag->setDefault for multiselect checkbox really? $this->tag->setDefault(['countries'], 1); - working normally $this->tag->selectStatic('countries', $optionsArr);

If I have selected many defaults values in this checkbox $this->tag->setDefault(['countries'], [1,2,3]); - don`t support arrays (((

SOLUTION : $this->tag->setDefaults(['countries' => [1, 2, 3]])