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We use the co-Kleisli category for the comonad of
functions out of a fixed monoid to implement a generic
combinator library for type-safe format specifications.
Works with pretty much anything that's a monoid, with
specific support for String, Text (strict/lazy), and
ByteString (strict/lazy). Credit to Daniel Patterson
for introducing me to something that looked just enough
like it ought to be the composition for a category, and
Ryan Trinkle for the IsString instance. :)
