If you have all data in memory and want zero copy, isn’t that what a &[u8] is for? It sounds to me like Pipelines (I didn’t read that much about it so I might be wrong) manages internal buffers for you, does whatever I/O to fill them, and then exposes slices into it while allowing you to indicate that you’re done with a slice. It sounds very much like ringbuffers used in networking. I agree it’s useful but it’s fundamentally a different API and usecase from Read, or so it seems to me.
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