约束泛型实现真正的单态化。当编写where T : unmanaged时，即时编译器会为每个类型参数生成独立的本地代码路径。sizeof(T)成为常量，无效分支被消除。这与Rust通过泛型获得的优化相同——不是运行时调度，而是编译时特化。
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