Re: operator exclusion constraints

> After reading the docs in the patch I don't believe you're going to all
> this trouble to ensure two circles don't overlap. Can you give some
> better examples of what you're trying to achieve and why anyone else
> would care? (I'm busy, so are others).
>

Non overlapping time intervals is one use case - think about room
scheduling. I personally want to use it to ensure the consistency of
genomic annotations.

-Nathan