would like Promise.flatMap to exist
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it's not necessarily that I want it to be any more generic than promises or arrays, I just have an aversion to flat() on principle unless it's essentially flatMap(id)
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I think the JS one has a specifiable depth but I can never remember how it works across different languages and data structures; I just think it's an over-complicated function
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Apparently it removes "array holes" which I did not know was a thing until right now. Apparently `[1, , 2]` is a thing (and is not the same as `[1, undefined, 2]`)
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