Map mashing function

Henning Thielemann lemming at
Mon Aug 8 16:38:51 UTC 2016

On Mon, 8 Aug 2016, David Feuer wrote:

> I was wrong. It's possible to write the general safe merge function in 
> Haskell 98, by replacing the GADT with a record of functions. Sorry for 
> the confusion!

I would prefer that very much!

The discussion about it seemed to miss the libraries mailing list:

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