Are you suggesting to make the old method a proxy for __both__ of the new methods?

Because the previous signature ```public function fetchAssociated(Model $Model, $query, $ids)``` can serve as a proxy to ```protected function _fetchHasMany(Model $Model, $query, $ids)``` but I think it won't do it for ```protected function _fetchHasAndBelongsToMany(Model $Model, $query, $ids, $association)``` without changing the signature.
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