The API recognizes that synchronous data sources are both necessary and common. The application should not be forced to always accept the performance cost of asynchronous scheduling simply because that's the only option provided. At the same time, mixing sync and async processing can be dangerous. Synchronous paths should always be an option and should always be explicit.
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testSort(heapSort, "Heap", arr, N);，推荐阅读同城约会获取更多信息
'loadedmetadata',