<blockquote>
<p>likely you'd also want to get notifications if the shape of an object changes without the osm object changing (moving around nodes of a way or relation)</p>
</blockquote>
<p>Yes, I think the notification would trigger if the version of the osm object (node, way, relation) you're watching has increased. Hence tag changes, geometry changes both result in the version of the object increasing.</p>

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