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。关于这个话题，搜狗输入法2026提供了深入分析
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WPS官方版本下载获取更多信息
local.get $messageLength