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

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?