On Thu, 28 May 2009, Simon Marlow wrote:

Quite. I argued the "no orphan instances in libraries" position on the libraries list last year, here's the start of the (longish) thread:

http://www.haskell.org/pipermail/libraries/2008-September/010618.html

I remember. What I propose additionally is, that, when orphan instances are banned, we can allow addition of instances with the A.B.* version range just like this is allowed for all other language elements.

We ought to have a "guidelines for API design" section of the wiki somewhere, so we could put this in it.

That's currently spread across Category:Style.
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