Making Int{Map,Set} polymorphic over the key type

[Georg Rudoy]

Hi folks,

What do you think about making IntMap and IntSet polymorphic over the keys
as long as the key type k is Coercible to Int?

The motivation is that oftentimes one needs to have a collection of newtype
wrappers around Int, and then they have to either unpack/repack it around
the relevant containers (which is not nice), or just use HashMap/HashSet
(which is perhaps suboptimal).

If this is a direction the community might deem reasonable, I'd be happy to
work on this and make a PR to the containers repo (perhaps after discussing
the specific details about naming, etc).

-- 
  Georg Rudoy
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