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泛型没有内建的协变类型?

这是因为数组在语言中是完全定义的,因此可以内建编译和运行时检查;而在使用泛型时,编译器和运行时系统都不知道你想用类型做些什么,以及该采取什么样的规则。这句话如何理解呢,用数组编译器和运行时系统就知道你想用类型做些什么吗?


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