@rwv Thank you!
Yep, I reuse some parts of CIDER (for example bencode and related utils), but not much can be reused unfortunatelly, there are a lot of legacy + clojure-specific stuff, so it hard to share code with Arei. Probably some fancy continuations stuff + debugger for scheme will be completely irrelevant for Clojure and CIDER. So I think it's ok to develop those projects in parallel.