Proposal: more general unionWith for Data.Map

[Johan Tibell]

On Tue, Jan 24, 2012 at 11:58 AM, Milan Straka <fox at ucw.cz> wrote:
> FYI, the new intersectionWithKey is not released yet -- maybe we could
> leave intersectionWithKey as it is, and provide mergeWith[Key] instead.
> Opinions?

I think so. We should avoid the words union and intersection if they
don't correspond to the mathematical idea, or we risk confusing
people.