diagrams/monoid-extras — pull request #1 by byorgey (2012-09-03 01:52:51+00:00)
Title: Remove tuple instances, add documentation, and bump version

`monoid-extras-0.1.1.0` (currently released on Hackage) is broken since it added instances like

```
instance (Action m a, Action m b) => Action m (a,b)
```

which is a perfectly nice `Action` instance, except that it overlaps with a lot of existing instances. These commits remove the offending instances, bump the version as required, and add some documentation explaining the awkward trickiness so this sort of thing hopefully doesn't happen again.