[saghm]

Using the term "backtracking" feels somewhat confusing, because it seems like most of the "fixed" letters they propose use what I would find more intuitively described as backtracking: having to trace back the exact path used to get to a given point in order to get back to a previous point to start drawing a new mark from. I think I'd be less confused by a term like "annotations" for what they're talking about.

[wgd]

Yeah, I originally expected this to be about a cursive variant which could be plotted as a single-valued function or something.

[saghm]

That's a fun way of thinking about it! I hadn't considered that