[OSM-talk] License plan

[MP]

> If we follow the rule of reverting incompatible changes only 2 is
> reverted to 1 (A’s scribble gets added back in).  3 is considered an
> independent change.  We end up with both a scribble and a neat road in
> the same area.  This situation likely won’t be easy to detect until
> after the changes, when validators will gleefully litter the map with
> warnings about overlapping ways.

That is perhaps worse than "we'll just delete/revert 5% of data".
Because this revertion/deletion would cause another perhaps 20% of
data (and it won't be always easy to spot them in the remaining 95%)
to be left in more or less inconsistent state that would need some
work to get consistent again.

Martin