Proposal: add integer division to GHC.TypeLits

[Alexey Vagarenko]

I'd like to propose adding Div, Mod and DivMod type families to
GHC.TypeLits,
which would be promoted versions of methods of Integral class.

type family Div :: Nat -> Nat -> Nat
type family Mod :: Nat -> Nat -> Nat
type family DivMod :: Nat -> Nat -> (Nat, Nat)

I've made trac ticket for this https://ghc.haskell.org/trac/ghc/ticket/13652
some time ago, but it hasn't got much attention.
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