// Create a push stream
简单说，路径不同，遭遇的风险也完全不同。
。关于这个话题，同城约会提供了深入分析
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The new API has complete parallel sync versions: Stream.pullSync(), Stream.bytesSync(), Stream.textSync(), and so on. If your source and transforms are all synchronous, you can process the entire pipeline without a single promise.