Region system adopted from ModernUO (chosen as the most robust baseline), including polymorphic JSON loading via $type.
ВсеПрибалтикаУкраинаБелоруссияМолдавияЗакавказьеСредняя Азия，更多细节参见PDF资料
，这一点在PDF资料中也有详细论述
Виктория Кондратьева (Редактор отдела «Мир»)
Conditional set: set_if atomically sets the value only when the current value satisfies a predicate, useful for state machine transitions that should only happen from a specific state.，详情可参考雷速体育