for / while else doesn't make sense

[Random832]

On Sun, May 22, 2016, at 14:06, Jon Ribbens wrote:
> This would be true if we had some Grand Unified Lossless Number Type.
> Unfortunately, we don't, and we're not likely to any time soon.

Scheme manages fine without one. It uses lossless types where it can,
and lets you detect that an "inexact" number (which could be float, or
could be any of the other types with an inexact flag set) was used where
it can't.