[Haskell-cafe] Help with Binary Serialization

I was wondering if somebody could talk me through the default derived format for binary serialization used, either by binary or by cereal. I'm trying to share data between Haskell and another function language (Elm) which also supports algebraic data types, so the conversion of data should be pretty trivial. I'd like to be able to just derive encode and decode in Haskell using either binary/cereal, and then write a parser for the same format in Elm. The trick is, I don't know what that format is. Is there any documentation on it, or if not, is anybody familiar enough with it that they could explain the format to me? Thanks!