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The 'last_changed' incrementor is used to invalidate the `get_terms()` query cache. Since `get_terms()` queries may reference 'meta_query', changing term metadata could change the results of the queries. So we invalidate the cache on add, delete, and update. See #10142. git-svn-id: https://develop.svn.wordpress.org/trunk@34538 602fd350-edb4-49c9-b593-d223f7449a82