transform(chunk, controller) {
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The primary signal is desiredSize on the controller. It can be positive (wants data), zero (at capacity), negative (over capacity), or null (closed). Producers are supposed to check this value and stop enqueueing when it's not positive. But there's nothing enforcing this: controller.enqueue() always succeeds, even when desiredSize is deeply negative.。业内人士推荐快连下载-Letsvpn下载作为进阶阅读
更有意思的是，资本市场的反应也很诚实。
// 从左找第一个大于pivot的