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.
Because I am deeply concerned about users losing their most sacred data.
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America was mired in Vietnam abroad and civil unrest at home. But at that moment, it seemed that humanity was united.
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Real-world failures
第十九条 为了免受正在进行的不法侵害而采取的制止行为，造成损害的，不属于违反治安管理行为，不受处罚；制止行为明显超过必要限度，造成较大损害的，依法给予处罚，但是应当减轻处罚；情节较轻的，不予处罚。，这一点在搜狗输入法2026中也有详细论述