Aaah, gotcha. The problem there is that there are already several arrows pointing to J. So if I change J then I have to update all of them too. And then have

Aaah, gotcha. The problem there is that there are already several arrows pointing to J. So if I change J then I have to update all of them too. And then have them regression tested. (It's usually the cost of regression testing that causes the most crustiness.)