[Haskell-cafe] Mystery of an Eq instance

[Colin Adams]

On 21 September 2013 08:34, Stijn van Drongelen <rhymoid at gmail.com> wrote:

> * As mentioned, there is a total order (Ord) on floats (which is what you
> should be using when checking whether two approximations are approximately
> equal), which implies that there is also an equivalence relation (Eq).
>

how do you get a total order when nan compares false with everything
including itself?
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