would like Promise.flatMap to exist
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I want [Promise [a]] -> Promise [a]
If you can go `[Promise a]` to `Promise [a]` you can go `[Promise [a]]` to `Promise [[a]]` which is good enough since you can go from `[[a]]` to `[a]`
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Which... Isn't helpful at all to your original tweet now that I've read it again, since `Promise.all(promises).then(Array.prototype.flat)` is a thing, and having those be more generic isn't remotely helpful for what you asked for
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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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