Adding a newtype EndoCategory to Control.Category (ticket #3362)

[roconnor at theorem.ca]

>> Oh, that is a quite a downside.  I wonder if we can get cabal stats on
>> this without difficulty.
>
> The only packages on hackage containing instances for Endo are:
>
>  base
>  HStringTemplate
>  monoids
>  special-functors
>  TypeCompose

Is this few enough that we can make our change?

-- 
Russell O'Connor                                      <http://r6.ca/>
``All talk about `theft,''' the general counsel of the American Graphophone
Company wrote, ``is the merest claptrap, for there exists no property in
ideas musical, literary or artistic, except as defined by statute.''