Most userland implementations of custom ReadableStream instances do not typically bother with all the ceremony required to correctly implement both default and BYOB read support in a single stream – and for good reason. It's difficult to get right and most of the time consuming code is typically going to fallback on the default read path. The example below shows what a "correct" implementation would need to do. It's big, complex, and error prone, and not a level of complexity that the typical developer really wants to have to deal with:
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，这一点在51吃瓜中也有详细论述
let totalBytes = 0;
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，更多细节参见夫子
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│ ┌───────────┐。关于这个话题，im钱包官方下载提供了深入分析