Data.IntSet bug

[Ian Lynagh]

Hi all,

Can someone familiar with Data.IntSet please look into

    http://hackage.haskell.org/trac/ghc/ticket/1762
    wrong result of isProperSubsetOf

    IntSet.isProperSubsetOf (IntSet.fromList [2,3]) (IntSet.fromList [1,2,3])
    is evaluated to False, but should be True.


Thanks
Ian