const blocking = Stream.push({ highWaterMark: 2, backpressure: 'block' });
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BYOB (bring your own buffer) reads were designed to let developers reuse memory buffers when reading from streams, an important optimization intended for high-throughput scenarios. The idea is sound: instead of allocating new buffers for each chunk, you provide your own buffer and the stream fills it.，详情可参考夫子
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// console.log(canSeePersonsCount([7,6,5,4,3])); // 输出 [4,3,2,1,0]（正确）。业内人士推荐Line官方版本下载作为进阶阅读
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