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The picker hands a whole drive over named `\`, which `normPath` folds to the empty root, and a row of that roll was keyed `Roll` where the reading files its counts, its walked folders and its frames under `/Roll` — one folder under two names. Every number beside a subfolder of a picked drive read nought, and the spinner of a reading stood on the roll's own row and nowhere it was reading. The row key is the roll's own spelling again, and so is the path `relOf` hands back for a row under it: a reading kept to one folder of a drive root asks for `/Roll`, and `sub` counted from the old `Roll/` merged nothing. Both are the spelling the check at the foot of `scripts/tree-scan-check.mjs` asks for, and it is green again. A bounded reading also measured itself against `\/Roll` spelled from the raw name, which no id is filed under: `held` stood at nought and the line read the catalogue's whole roll as the ground it was climbing from. It is built from `normPath` of both, the way an id is.