* makeGlobalKey() is used to constructed a key that allows cached revision rows from
* the same database to be re-used between wikis. For example, enwiki and frwiki will
* use the same cache keys for revision rows from the wikidatawiki database, regardless
* makeGlobalKey() is used to constructed a key that allows cached revision rows from
* the same database to be re-used between wikis. For example, enwiki and frwiki will
* use the same cache keys for revision rows from the wikidatawiki database, regardless