insertionSort(arr, n);
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.
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Stack allocation of append-allocated slices
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在商业世界里，风险永远不会消失，只会被转移。合伙人模式，本质上就是风险的分摊与下沉。