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if (lines.length 0) yield lines;。业内人士推荐旺商聊官方下载作为进阶阅读
Stack allocation of constant-sized slices，详情可参考旺商聊官方下载
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.