[racket] #<undefined> and backward compatibility

If you have a chance to give it a try and let us know what you can
about what happens, we'd be very interested.

Robby

On Fri, Apr 18, 2014 at 9:55 AM, Neil Van Dyke <neil at neilvandyke.org> wrote:
> I don't think this change would affect any code I've written.
>
> There are a few parts of one large system on which I consult that *might* be
> affected, but probably not.  (Parts written a long time ago by unknown
> superintelligent ancient astronauts, who I suppose might use undefined
> values, or knowingly let them happen incidentally.  And parts later worked
> on by mere humans who wouldn't be aware when they were creating situations
> in which there can be undefined values, especially if the undefined values
> are never actually used.)
>
> Neil V.
>