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

[Henning Thielemann]

On Sat, 29 Jun 2019, Georg Rudoy wrote:

> 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).

There is already the enummapset package.