Watch out for NaNs

[jbe]

@scottmcm

@jbe

Should −∞ and +∞ be distinguished, and if we don't distinguish them, how do they compare to other numbers?

That's the choice […]

I had this idea in the other thread:

@jbe

My personal favorite would perhaps be to have NaN and one(!) infinity (which covers both positive and negative infinity), where infinity is greater than and smaller than any other value. But that would certainly break everything . (And I'm sure there are other bad implications. It also can't be implemented with PartialOrd .)