[Haskell-cafe] instance Enum Double considered not entirely great?

Evan Laforge qdunkan at gmail.com
Tue Sep 20 23:56:53 CEST 2011

> I actually think the brokenness of Ord for floating point values is
> worse in many ways, as demonstrated by the ability to insert a value
> into a Data.Set.Set and have other values "disappear" from the set as
> a result. Getting an unexpected element in a list doesn't really seem
> as bad as silently corrupting entire data structures.

Whoah, that's scary.  What are some examples of this happening?  Does
this mean it's unsafe to store Doubles in a Map?

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