I wrote srfi-171, which inplements transducers for scheme: https://srfi.schemers.org/srfi-171/srfi-171.html https://srfi.schemers.org/srfi-171/srfi-171.html It

I wrote srfi-171, which inplements transducers for scheme: https://srfi.schemers.org/srfi-171/srfi-171.html https://srfi.schemers.org/srfi-171/srfi-171.html It starting to be quite some time ago, but I can answer some questions if you have any.