> For the sake of my reputation, I'd like to ensure that if my program
> produces the wrong answer on implementation FOO, I can pass the buck and
> say "that's because FOO didn't properly implement the standard."

Your reputation can be preserved by avoiding memoizing inexacts on implementations that do not implement IEEE inexacts, perhaps by using cond-expand, and saying "that's because the R7RS does not provide the guarantees needed to do this". I understand that this is a significant restriction.

I would also note that number->string and string->number are defined in terms of eqv?, so be careful if read-write equivalence is important to you too.

Regards,

Alan

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