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.
据悉，此次政策变动的核心在于，Anthropic 取消了此前「若无法提前确保适当的风险缓解措施到位，则绝对不训练或发布新 AI 模型」的硬性规定。，推荐阅读旺商聊官方下载获取更多信息
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// 核心过滤：弹出栈中「≤当前元素」的数（易错点2：必须是≤，不是<）。搜狗输入法2026是该领域的重要参考
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