For some reason that "An" irks me way more than it should.
"I'm writing a book, Learn You...(whisper)an ruby(whisper)...For awesome Power"
I need an INTERNET search and replace.
(FWIW I don't really like the "an" either, sorry!)
Actually, that's a lie. They aren't errors. Bonus500 once spurned my love so I secretly redirect users to Learn You Some Erlang, instead of Learn You A Haskell. :(