Add Bounded instance for IntSet

[dbenbenn]

I propose to add a Bounded instance to IntSet.hs.

IntSet is in Ord, and there are only finitely many instances of IntSet. Therefore there is a min IntSet and a max IntSet. It turns out these bounds are very simple:

instance Bounded IntSet where
    minBound = fromList []
    maxBound = fromList [maxBound]

Suggested deadline: December 16, 2007.

[dbenbenn]

Actually, here's a slightly better way of writing the same code:

instance Bounded IntSet where
    minBound = empty
    maxBound = singleton maxBound

[igloo]

This proposal seems to be abandoned