By the way, one oddity about highway=pedestrian is that about a third of the occurrences are areas or multipolygons, on which a oneway=yes tag would be unusable and probably erroneous. Among the one-way pedestrian streets mapped as ways, 13,600 are tagged as lines (more than the number of one-way highway=footways) and fortunately only 27 are tagged as areas.
(In case you’re wondering, 14 one-way service roads are mapped as areas.)