Finding these optimization opportunities can itself be a significant undertaking. It requires end-to-end understanding of the spec to identify which behaviors are observable and which can safely be elided. Even then, whether a given optimization is actually spec-compliant is often unclear. Implementers must make judgment calls about which semantics they can relax without breaking compatibility. This puts enormous pressure on runtime teams to become spec experts just to achieve acceptable performance.
block: Writes wait until buffer space is available. Use when you trust the producer to await writes properly.，推荐阅读heLLoword翻译官方下载获取更多信息
，这一点在夫子中也有详细论述
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