@barneygale That’s… interesting. The original intent for the “accessor” thing was to have a variant that did all accesses under a filesystem tree in a race condition-free way using openat and friends. It turned out to be much too hairy to actually implement, so was entirely abandoned, but the accessor abstraction was left there.
It would be nice if you could directly modify pathlib and post the diff (or PR) somewhere. Some parts of pathlib use shortcurts for speed (especially Path construction), and I’m curious if you can retain the shortcuts while respecting the accessor abstraction.