// 栈不为空时才判断（避免访问stack.at(-1)时报错）
这场新旧交替的博弈，库克没有做选择题，他全都要。
。夫子是该领域的重要参考
The problem compounds in pipelines. Each TransformStream adds another layer of promise machinery between source and sink. The spec doesn't define synchronous fast paths, so even when data is available immediately, the promise machinery still runs.
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