On 11 January 2016 at 18:45, Henning Thielemann <lemming@henning-thielemann.de> wrote:

On Mon, 11 Jan 2016, M Farkas-Dyck wrote:

I have seen these redefined many times now. Examples:
https://hackage.haskell.org/package/numericpeano-0.2.0.0/docs/Numeric-Peano.html#t:Nat
https://hackage.haskell.org/package/numeric-prelude-0.4.2/docs/Number-Peano.html#t:T
https://hackage.haskell.org/package/type-fun-0.0.1/docs/TypeFun-Data-Peano.html#t:N
https://hackage.haskell.org/package/number-0.1.1.0/docs/Data-Number-Peano.html#t:Nat
https://hackage.haskell.org/package/Peano-0.0.4/docs/Data-Peano.html#t:Peano

 Type-level Peano number are also contained in:
  https://hackage.haskell.org/package/tfp-1.0.0.2/docs/Type-Data-Num-Unary.html

and data-level Peano numbers in this playground module:
  http://code.haskell.org/~thielema/htam/src/Number/PeanoNumber.hs


I'd prefer that 'base' shrinks rather than grows. If we find that people like one implementation most, you could bless it by adding it to the Haskell platform.


Same here, -1 on adding a particular implementation into base.
 
You might add a comparison of the packages to the Wiki page:
  https://wiki.haskell.org/Peano_numbers

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