would like Promise.flatMap to exist
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this isn't really flatMap it's more like internal concat
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does this generalise for any monad m? i.e. [m [a]] -> m [a] or even n (m (n a)) -> m (n a), if m and n are monads like, you're flattening one monad that's got another one sandwiched in between
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Yeah, `sequenceA . (fmap join)` should (not 100% sure I have syntax correct there, but use sequenceA to get `m (n (n a))`, and then fmap join gives you `m (n a)`
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