https://travelmapping.net/hb/showroute.php?r=frages.d01596ae&lat=48.248305&lon=7.340938&zoom=16
These edges can come out of siteupdate in whatever order. (Probably because the order they're written depends on the order they're stored in adjacency lists depends on the order they're created depends on the order vertices are passed to the collapsed edge constructor depends on the order vertices are stored in the unordered_set which can be whatever.)
[x] Check more stuff before returning.
[x] Related: Why do I have so many versions; how do they differ? Get rid of stuff!
https://travelmapping.net/hb/showroute.php?r=frages.d01596ae&lat=48.248305&lon=7.340938&zoom=16 These edges can come out of siteupdate in whatever order. (Probably because the order they're written depends on the order they're stored in adjacency lists depends on the order they're created depends on the order vertices are passed to the collapsed edge constructor depends on the order vertices are stored in the unordered_set which can be whatever.)