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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.
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integration with GA, GMB, and GSC.。业内人士推荐爱思助手下载最新版本作为进阶阅读
block: Writes wait until buffer space is available. Use when you trust the producer to await writes properly.