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.
The trap Anthropic built for itself
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宋刚：客观来看，海外竞品同样缺乏复杂的“一句话办事”能力，整体发展滞后于国内。我们将依托软硬件优势及模型能力，先与海外现有水平拉齐，逐步构建本地化服务能力。用户认知的培育也需要时间。
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