[Haskell-cafe] What is Data.Vec.DataFamily.SpineStrict.Pigeonhole and why is it following me?

[Galaxy Being]

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Content preview:  This <https://hackage.haskell.org/package/vec-0.4/docs/Data-Vec-DataFamily-SpineStrict-Pigeonhole.html>
   in Hackage is something a rank amateur like me can't fathom. I just hit a
   chapter in a book that dives into the Pigeonhole Principle. Is this the "accompanying
   Haskell Wundercode" for the math world's PHP? I know PHP is a big deal in
   math. I don't see an "author," and I see no documentation. Anyone know how
   I can figure this mystery out, like at least find the author or someone that
   knows something about this? [...] 

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Subject: What is Data.Vec.DataFamily.SpineStrict.Pigeonhole and why is it following me?
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