优先级策略说明1唤醒空闲线程成本最低，复用已有线程2减少活跃计数活跃线程够用，标记自己「不活跃」即可3创建新线程最后手段，真正新增一个 worker
Transform backpressure gaps: Pull-through transforms execute on-demand. Data doesn't cascade through intermediate buffers; it flows only when the consumer pulls. Stop iterating, stop processing.
，这一点在clash下载 - clash官方网站中也有详细论述
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