I really should release my library of mine that does that at compile-time… >.>
Hmm, actually you could use my ProtocolEx (it’s like the Protocol Library built into elixir, except it is based on matchers and guards instead of types, and has the ability to be faster too by inlining and more) library if you don’t mind putting your parse functions in implementation modules (you can of course put multiples of the parse functions in a single implementation if you want, so you can group like-functionality. 
