<p>I doubt it would break backwards compatibility in any practical way. It is unlikely that anyone is using flags like tiger:upload_uuid except for the db on errol. People doing very unusual things with osm2pgsql should not use default.style from the package for consuming minutely updates or else we would never be able to change it.</p>
<p>It's also worth noting that for many of these tags they are generally only ever dropped in minutely diffs because most editors will remove them.</p>
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