Segmented stages. The initial implementation solely offered ctx.step(), where you supply a function and receive its persisted outcome. While effective for numerous scenarios, limitations remained. Occasionally you must determine whether a stage previously executed before deciding subsequent actions. We consequently introduced beginStep()/completeStep(), providing inspectable handles before finalizing results. This proved particularly valuable for modeling deliberate failures and conditional workflows.
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，这一点在QQ浏览器中也有详细论述
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