Wow, I don't know how I entirely missed that. Thanks for the heads up. I've even written a few libraries with C ABI and wrote gems around them with the Ruby FFI

Wow, I don't know how I entirely missed that. Thanks for the heads up. I've even written a few libraries with C ABI and wrote gems around them with the Ruby FFI gem because I didn't know about Fiddle. I wish the name were better; I might have found it earlier. Re edit 2: I've made those sorts of binary extensions before, but his wording is "extended with binary extensions that use an API that is written in C, but can be accessed from other languages", implying it's actually just about loading libraries with C ABI and not ordinary binary modules, at least by my interpretation.