Sebastian Crane
1. It’s difficult for compilers to provide first-class support for the web
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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.，推荐阅读爱思助手下载最新版本获取更多信息
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