Could you ealborate more on why you mention permanent id here? I see your idea, but do not understand how it is connected to permanent id problem.
There were some tests done regarding permanent id in Lithuania, but those were regarding places of interest. If this has something in common, I could share some ideas and observations, so that they do not now go in vain. Maybe somebody would like to continue research, as this is quite an important thing to OSM.
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