I was looking recently into transforming a stream in a one-to-one way that requires maintaining an additional accumulator during the transition. That's an obvious use case for map_reduce with Enum, but with Stream we lack such a function. We have transform/3 that is somewhat equivalent to Enum.flat_map_reduce, that we could use here, but I think I'd prefer something simpler. I'm not 100% sure about the name, though.
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