My more serious objection is the inclusion of $ in the "stable" branch. Whatever makes it easy for you to do experiments in the wiki is fine with me. However the stable branch is advertised as being arcn + bug fixes, and I don't think taking over a punctuation symbol in support of fixing a couple of bugs such as "date" and "mkdir" qualifies.
Yeah, I wasn't really sure about this. It seemed to be the path of least resistance, but if you want to write make-directory, which-os, and so forth (or their more primitive components) in Scheme and get rid of $, go for it.
There is still seval, right? You could use seval rather than $ in the stable branch, since it won't have to be updated except for arcn releases and bug fixes, so maintenance won't be too much of a problem. And it doesn't require writing entirely new library functions to implement.
