// 1. 建堆：从最后一个非叶子节点开始向上调整
Why am I writing this today?
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Updates from the match in Colombo; 1.30pm GMT start
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.