[racket-dev] nan?, infinite? and regular-real? [Was: Latest Plot Package]

On Sat, Nov 19, 2011 at 9:54 AM, Doug Williams
<m.douglas.williams at gmail.com> wrote:
> I would keep finite? for the semantics associated with the name even if it
> is just a renaming of rational?. Particularly since you can't just use (not
> (infinite? x)) when NaNs are a possibility. [I personally don't like using
> rational? for an abstraction that includes irrational numbers.]

Forgive me for being dense, but IIUC, aren't there no irrational
numbers in Racket? Or, put another way, which class of numbers do you
find useful to single out using rational??

Robby