if (n <= 1) return;
习近平总书记深情地说：“衡量干部业绩好不好，关键要看老百姓口碑好不好。各级领导干部要向谷文昌同志学习，树牢正确政绩观，为官一任、造福一方，真抓实干、久久为功，把丰碑立在人民群众心中。”
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Backpressure is strict by default. When a buffer is full, writes reject rather than silently accumulating. You can configure alternative policies – block until space is available, drop oldest, drop newest – but you have to choose explicitly. No more silent memory growth.
stack. But what about all those intermediate slices that just become