The primary signal is desiredSize on the controller. It can be positive (wants data), zero (at capacity), negative (over capacity), or null (closed). Producers are supposed to check this value and stop enqueueing when it's not positive. But there's nothing enforcing this: controller.enqueue() always succeeds, even when desiredSize is deeply negative.
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His designs created a flattering silhouette, with cinched belts at the waist and structured shoulders heavily peppered across the collection.，详情可参考91视频
* @param arr 待排序数组