git.iko.soy/isoparsec
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isoparsec/random-notes.md
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1Implied `Isoparse m =>` everywhere
3`m () a` -- parser produces an `a` out of thin air and printer consumes an `a`.
4`m a ()` -- printer consumes an `a` and the printer produces an `a`.
5`a -> m () ()` -- `a` is a global constant used by both the parser and the printer.