> What is your use case for this?
I'm using it in guitktk [1]
> Also, you say you have "spreadsheet formulas", but is it possible to apply a formula to a range of nodes, like you can in an actual spreadsheet?
You can apply to all children of a node like len(`foo). In a different version, if you wanted to do that for an entire subtree, you could have something like len(list((`foo).dfs()))
[1] https://blog.asrpo.com/gui_toolkit
