Thinking some more about this, I am asking myself whether this is really about
the geometry itself, not just the expire tiles. Drawing a 1000km² building is
already a problem even if there is no expiry involved. That would give us also
more options on how to do the checking. We can do this today, calculate the
area or the length of a feature in Lua. It isn't a problem to not write such a
geometry to an output table in which case it would also no show up in an expire
list. So if somebody changes a building and makes it 1000 times bigger than
before it would simply vanish, triggering an expiry of the tiles covering the
old geometry. (Actually detecting that this is a problematic change and leaving
the old object in place would be better, but that's a whole other can of worms.)
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