// 易错点4：栈空时返回1而非i+1 → 仅i=0时正确，i0时（如i=3）会返回1而非4
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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