Return the first of two types, aka the kestrel combinator.
https://hackage.haskell.org/package/data-aviary-0.4.0/docs/Data-Aviary-Birds.html
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Return the first of two types, aka the kestrel combinator.
https://hackage.haskell.org/package/data-aviary-0.4.0/docs/Data-Aviary-Birds.html