Re: noverlay branch

[Stefan Monnier]

> As a practical matter, `interval_tree_insert_fix` asserts it, and that
> was failing for me.  I wanted it to fail earlier.

Ah, I see we depend on it in our implementation of insertion.  OK.
Then maybe it's best to keep this assertion in the insertion code
or at least add a node explaining why we require it.

> I'm inclined to keep it the way it is, if only for reasons of inertia.

I have no trouble with it, indeed.  It's just subtle enough to warrant
a comment.


        Stefan