// Consumer provided a buffer - we MUST fill it (or part of it)
// ⚠️ 易错点2：循环条件写left <= n-1（会导致left+1越界），或把<=写成<（漏判相等的有序情况）。关于这个话题，heLLoword翻译官方下载提供了深入分析
If a line was the same as it was on the last frame, it was skipped。业内人士推荐im钱包官方下载作为进阶阅读
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await blocking.writer.write(chunk2); // ok