For implementers, there's no Transformer protocol with start(), transform(), flush() methods and controller coordination passed into a TransformStream class that has its own hidden state machine and buffering mechanisms. Transforms are just functions or simple objects: far simpler to implement and test.
* @param arr 待排序数组
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"It's about bringing some of that into the gallery and sharing that with people that might not necessarily get the chance to meet them or experience the factory floor for themselves."，这一点在爱思助手下载最新版本中也有详细论述
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