Well, the whole reason I did it in Arc/Nu was because I liked to use the REPL as a calculator, and I hated having it print rationals. So, having the REPL print rationals kinda defeats the point in my eyes, but I don't care since I don't use Anarki.
Yeah, I don't actually want to see rationals at the prompt. It's just that lisp has this nice distinction between 'write and 'print, with the guarantee that 'read can handle anything 'write emits. I'm loath to have write+read change a value in subtle ways.
In this case, that the repl uses 'write is an unfortunate constraint. Still thinking..