Monadic extension for flatMap #36
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flatMapis really handy, but the fact it has to return aSequencemake it a bit cumbersome to use. In this PR I introduceflatMapMwhich is a more "monadic" version offlatMapthat allows the user to return anyIterableinstead.seq.flatMapM(f)is strictly equivalent toseq.map(f).flatMap(asSequence).