I wanted to run something by you guys. I find some of the stuff in util.arc indispensable - to the point that basically all my programs require it.

I don't see a big problem with expanding the core language to include functions I commonly use (and are relatively well-written). These include, for example, butlast, len=, len-, car<, cdar, cadar, mapcar, mapcdr, mapeach, and between.

How do you guys feel about moving them into arc.arc? util.arc feels a bit like a growing wart to me.