Substitutability, was Re: Finding the spirit of L-World

[Florian Weimer]

* Stephen Colebourne:

> PS. How bad would it really be to change NaN == NaN to be true?
> Wouldn't any breakages be pretty minor?

There's more than one NaN, so it would still be magical.  x != x for
checking for NaN is also quite widespread.

Thanks,
Florian