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핵심 타입은 Any 이놈을 통해 dyn Any에서 타입체킹과 변환이 가능함


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이렇게 단순한 이유는 상속이 없어서 단순히 같은 타입인지 여부만 따지면 되기 때문




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Any는 모든 타입이 구현한다