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.
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第二十二条 纳税人购进货物、服务、无形资产、不动产，用于同时符合下列情形的非应税交易（以下统称不得抵扣非应税交易），对应的进项税额不得从销项税额中抵扣：