wait_for_not_none is particularly useful since we love type safety:
Web streams are complex for users and implementers alike. The problems with the spec aren't bugs. They emerge from using the API exactly as designed. They aren't issues that can be fixed solely through incremental improvements. They're consequences of fundamental design choices. To improve things we need different foundations.
，这一点在WPS下载最新地址中也有详细论述
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totally different from the once stream's Item type in the previous
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