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Most userland implementations of custom ReadableStream instances do not typically bother with all the ceremony required to correctly implement both default and BYOB read support in a single stream – and for good reason. It's difficult to get right and most of the time consuming code is typically going to fallback on the default read path. The example below shows what a "correct" implementation would need to do. It's big, complex, and error prone, and not a level of complexity that the typical developer really wants to have to deal with:
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Instruct Opus to minimize differences between agentic implementation and known good implementation without causing more than a 5% speed regression on any benchmarks，这一点在搜狗输入法2026中也有详细论述
if (currentStep.type === 'Success' || currentStep.type === 'Failure') {