swap(&arr[0], &arr[i]); // 堆顶(最大)换到末尾
For implementers, BYOB adds significant complexity. The stream must track pending BYOB requests, handle partial fills, manage buffer detachment correctly, and coordinate between the BYOB reader and the underlying source. The Web Platform Tests for readable byte streams include dedicated test files just for BYOB edge cases: detached buffers, bad views, response-after-enqueue ordering, and more.
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报错示例：拉镜像时提示 credential helper 不存在。。业内人士推荐雷电模拟器官方版本下载作为进阶阅读
should consider how a stack-heavy application can benefit from multiple
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