[capableweb]

Maybe you and I have different understandings about what "Proof of Concept" means, but if you're supposed to deliver cross-language interoperability and have successfully delivered it to three different languages with wildly different runtimes, I think I'd consider that a successful proof of concept and since you're demonstrated that the bindings works for at least two other languages, it's more or less trivial to get it to work for N other languages, so this is clearly beyond the proof of concept stage at this point, and trying to reach a maturity stage instead.