I have done the translation from Scheme to Clojure which raises the possibility that some of the typing could be done gradually with spec; I haven't worked with

I have done the translation from Scheme to Clojure which raises the possibility that some of the typing could be done gradually with spec; I haven't worked with typed scheme. There's a lot of code in the simplifier which is designed to work with S-expressions containing symbols. Changing them to work with an enriched type carrying unit information would be a big undertaking