RFC: Change rules for adding/changing test cases

[DJ Delorie]

> I don't dispute any of that.  I just think the testcase isn't necessarily 
> the right place for it; indeed I think this is exactly the information 
> that should be added to the PR when it is closed.  Far too often a case is 
> being closed with just:

Unfortunately, there's no process in place to regulate the contents of
PRs.  There is, however an approval process for patches.