Managed to get this working today: fully parallelized version of the Stream trait. Think Rayon but for @asyncrs.
Started on this 6 months ago, had a breakthrough yesterday, and will probably publish later today.pic.twitter.com/aptQ5fpqmp
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The other more obvious point is: the interface is quite different. buffer_unordered takes a stream of *Futures*. That's two layers of async, nested. parallel-stream on the contrary has a very familiar interface: it's the same as Iterator, ParallelIterator, and Stream.
Following up on my first reply: I guess it's possible to create a stream of task::Spawn and then set a max concurrency through buffer_unordered, which provides much of the same functionality. I think the key distinction overall is ease of use. The easiest API is the one you know
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