Originally, international law was unaccepting of treaty reservations, rejecting them unless all parties to the treaty accepted the same reservations. However, in the interest of encouraging the largest number of states to join treaties, a more permissive rule regarding reservations has emerged. While some treaties still <answer>expressly</answer> forbid any reservations, they are now generally permitted to the extent that they are not inconsistent with the goals and purposes of the treaty.
Because they are generally accepted under international law, a treaty must forbid reservations in what manner to prevent their adoption?
expressly