[slime-devel] Why not use system:add-fd-handler in cmucl?

The create-swank-server function in swank-cmucl.lisp has been changed from doing: (system:add-fd-handler fd :input #'accept-connection) into just doing: (accept-connection fd) This means one must enable multi-processing to run slime. I /think/ the former method is more efficient, but I guess that's marginal. The fact that local set up can more easily break slime is a real downside though. So what's the upside to this change?