Gah! Brain AWOL. I'm surprised no-one picked me up on
that. Why didn't I use:
splitAtMb n [] = Nothing
splitAtMb n l = Just $ splitAt n l
Actually, I've some code lying around doing exactly this (but without
the padding ;)), written with the coalgebra inlined:
split n = unfoldr $ \xs -> case xs of
[] -> Nothing
_ -> Just (splitAt n xs)
Cheers,
Stefan
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