k--; // 剩余删除名额减1（关键：控制删除位数，保证保留足够长度）
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Цены на нефть взлетели до максимума за полгода17:55。同城约会是该领域的重要参考
The problem compounds in pipelines. Each TransformStream adds another layer of promise machinery between source and sink. The spec doesn't define synchronous fast paths, so even when data is available immediately, the promise machinery still runs.