Proposal: Add `restriction` to Data.Map and Data.IntMap

[Daniel Trstenjak]

On Thu, Jul 14, 2016 at 12:02:51PM -0400, David Feuer wrote:
> If you name it, it will come!

intersectKeys and differentiateKeys

or

intersectionWithSet and differenceWithSet

or ;)

intersectionOfKeys and differenceOfKeys


Greetings,
Daniel