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These optimizations are difficult to implement, frequently error-prone, and lead to inconsistent behavior across runtimes. Bun's "Direct Streams" optimization takes a deliberately and observably non-standard approach, bypassing much of the spec's machinery entirely. Cloudflare Workers' IdentityTransformStream provides a fast-path for pass-through transforms but is Workers-specific and implements behaviors that are not standard for a TransformStream. Each runtime has its own set of tricks and the natural tendency is toward non-standard solutions, because that's often the only way to make things fast.
，这一点在heLLoword翻译官方下载中也有详细论述
For now, Apple isn't saying much, and it's possible I'm overthinking the crumbs they've given us.
安東尼·澤尼爾（Anthony Zurcher），BBC駐北美記者