Not all streaming workloads involve I/O. When your source is in-memory and your transforms are pure functions, async machinery adds overhead without benefit. You're paying for coordination of "waiting" that adds no benefit.
Publication date: 10 March 2026。业内人士推荐夫子作为进阶阅读
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mergeSortRecursive(arr, left, mid); // 排序左半部分