[steveklabnik]

It's all good, I have too much karma anyway.

The thing is, there's a difference between a true subset and "some flags that reject certain things." Because that creates a number of different sets that may relate to each other in a variety of ways, some subsets, some overlapping.

But beyond the specific definitions here, "profiles" is that sort of approach, so something like it will happen, probably. It seems to have a lot of support.