curr = curr-next;
无论你认为什么是“正确的事”，你无法通过拒绝现实来控制它。，详情可参考91视频
，详情可参考51吃瓜
strict (default): Rejects writes when the buffer is full and too many writes are pending. Catches "fire-and-forget" patterns where producers ignore backpressure.
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