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Maurice
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The single-via route is right for a detour dragged by hand and wrong for anything that derives its anchors from a line. Pinning a day onto a recorded track or a signed scenic road means a couple of dozen points, and one request each re-routes the entire trip once per point, spaced by the routing host's own rate limit — twenty anchors would spend half a minute drawing routes nobody asked to see. replace_legs names the legs to clear rather than taking a flag for the day, and that is the whole difference: a traveller who bent two legs by hand and then adopts a scenic road for a third has not asked to lose the two. The tools follow in the same change, as parity requires. Undoing a detour picks this up too, where the vias of one leg were deleted one request at a time.