// 易错点2：判断条件必须是<=，而非<（相等元素也无法作为「更大值」，需弹出）
qemu-img create -f qcow2 vm_disk.qcow2 20G
。关于这个话题，同城约会提供了深入分析
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.
即便愿意付正价的客人，看到身边人都在买折扣券，也会跟风选择，这就让门店陷入了“想服务正价客人、想保持合理利润却不可得”的困境。
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