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.
Try it yourself
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while (i < n1) {
Unlike IBM's ATMs before it, and, as we will see, unlike those after it as well,
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devtools = false
Photograph: Julian Chokkattu，更多细节参见91视频