Missing U-turns at dead-ends

While trying to detect illegal combinations of one-way streets in the LTN tool, I saw a bunch of false positives near dead-end streets. Except it turns out the maps currently don't have any U-turns there when they should!
This is a problem mostly in left-handed driving countries, but there's another case when a driveable road terminates in a cycle-only connection. Drivers can generally U-turn there too.