A small TypeScript pattern that often slips through reviews. You define a union, handle a couple of cases, and move on. Later, a new variant gets introduced. Nothing crashes immediately. But something is off. What happens when this function is called?

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提供了用户原本不知道的新信息;有直接可用的方法、工具或操作价值;它带来了新的事实、进展或信息,不是在重复旧内容

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