for (let i = n - 1; i = 0; i--) {
arr[k++] = leftArr[i++];
。关于这个话题，safew官方版本下载提供了深入分析
我的一位老师曾经建议：如果你能想象自己去做任何别的事，那你或许应该去做那件事。
Instead of yielding one chunk per iteration, streams yield Uint8Array[] — arrays of chunks. This amortizes the async overhead across multiple chunks, reducing promise creation and microtask latency in hot paths.
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