A big advantage of stepwise refinement is that when you want to explore a protocol variant, you don't start from scratch. You go back up to the appropriate level of abstraction, change one refinement step, and get a different protocol that still satisfies the same high-level specification. This is systematic design space exploration. With LeaseGuard, for example, we started modeling a lease protocol for Raft early. While refining the abstract spec, we discovered two optimizations we hadn't anticipated, including inherited lease reads, which we probably wouldn't have found without thinking at multiple levels of abstraction.
Middle East war live: Donald Trump says Iran war will be over ‘very soon’
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不动产市场依然走在筑底阶段，但嗅到“先机”的热钱已经枕戈寝甲，等待最佳的时机布局中国：这个时机大概率就在2026年。
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与此同时，伊朗与以色列继续在中东地区相互进行导弹袭击。