Model events: how saved differs from updated

A model reports its own changes, and cache clearing rests on that. But two ways of changing a field raise DIFFERENT events, and the difference once cost us wrong stock figures on the site.

$product->save();              saving, updating, updated, saved
$product->decrement("stock");  updating, updated — and that is all

Counters do not raise the "saved" event at all. So subscribe to "created" and "updated": between them they cover both an ordinary save and writing stock off on a purchase.