It is also necessary to emphasize that many optimizations are only possible in parts of the spec that are unobservable to user code. The alternative, like Bun "Direct Streams", is to intentionally diverge from the spec-defined observable behaviors. This means optimizations often feel "incomplete". They work in some scenarios but not in others, in some runtimes but not others, etc. Every such case adds to the overall unsustainable complexity of the Web streams approach which is why most runtime implementers rarely put significant effort into further improvements to their streams implementations once the conformance tests are passing.
// 计算天数：栈非空→栈顶索引-当前索引；栈空→0（易错点3：索引差别写反）
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黎廣德說，目前情況一直發展下去，政府能否找出合適的方案給居民，「其實這件事是不樂觀的」。
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