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When a host runtime provides a byte-oriented ReadableStream from the runtime itself, for instance, as the body of a fetch Response, it is often far easier for the runtime itself to provide an optimized implementation of BYOB reads, but those still need to be capable of handling both default and BYOB reading patterns and that requirement brings with it a fair amount of complexity.
，更多细节参见safew官方下载
Explicit backpressure policies
常见操作如滚动、缩放图片与 PDF 文件，将获得与 iPhone、iPad 类似的流畅触控体验。但苹果不会强化触控打字能力，MacBook Pro 将保持全键盘设计和大触控板体验。