优点：输出在 (−1,1)，比 sigmoid 居中，对梯度更友好
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从听取残障青年的心声，到记下职业院校师生的期盼，再到提出跨部门协同的建议，无不体现着韦军作为全国政协委员对民生问题的敏锐感知、推动解决问题的责任担当。“既要建言献策，也要参与基层实践。”韦军说，“推动提案从纸上的文字变成现实中的成果，这正是政协委员履职的价值所在。”
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.