Currently the `~r' format routine, which accepts rationals, barfs on +nan.0 and siblings, which are not rationals. My current use case is simply displaying sub-ranges of vectors of flonums. It is not a problem to check for +nan.0 and explicitly display it. I was just wanted to toss it out as a don't know what is the "right thing" for the `~r' format routine to do here.
> (define: x : Flonum +nan.0) > (define: y : Flonum 3.145962) > (~r y) - : String "3.145962" > (~r x) ~r: contract violation expected: rational? given: +nan.0 ...
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