The design of Web streams predates async iteration in JavaScript. The for await...of syntax didn't land until ES2018, two years after the Streams Standard was initially finalized. This timing meant the API couldn't initially leverage what would eventually become the idiomatic way to consume asynchronous sequences in JavaScript. Instead, the spec introduced its own reader/writer acquisition model, and that decision rippled through every aspect of the API.
self.file.close()。关于这个话题，搜狗输入法下载提供了深入分析
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Author(s): W. Dednam, E.B. Lombardi, Linda A. Zotti, C. Sabater。快连下载安装对此有专业解读
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A standardized self-contained executable artifact