Follow-up Comment #2, bug #62264 (project groff):
I had wondered idly if we needed a reverse iterator.
I thought, "surely not".
I'm thinking again.
See bug #64114, where I want to traverse backward along a string and truncate
it (toward the front) upon first hitting a slash.
Another possibility would be to have a node-list reversing request.
But that seems like a dangerous gun to hand the user.
On the other hand you can already suicide as hard as you like by walking
strings/macros/diversions with .substring and mangling them. So...maybe.
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