/**
* @param ILoadBalancer $lb Connection manager for $conn
- * @param Database|array $conn Database or (server index, query groups, domain, flags)
+ * @param IDatabase|array $conn Database or (server index, query groups, domain, flags)
* @param int $role The type of connection asked for; one of DB_MASTER/DB_REPLICA
* @internal This method should not be called outside of LoadBalancer
*/