Very nice.
I’m thinking about using it for an Elixir implementation of SPARQL for which I hope ProtocolEx would allow me to pattern match on AST expressions and my general tree traversal functions could call protocol dispatched functions on SPARQL graph patterns and algebra operators. Do you think it is possible and advisable to try something like that with ProtocolEx? How stable do you consider it?
Any chances this can become somehow part of the language? I’ve noticed that José forked it 
