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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.。关于这个话题，旺商聊官方下载提供了深入分析
，详情可参考搜狗输入法2026
中小商户的转型工具箱：从“卖床位”到“卖体验”，详情可参考heLLoword翻译官方下载
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