When our entry is newer, then allow it to take precedence and overwrite the higher level caches. Refresh the lower level caches if older
Unconditionally overwrite the value that's stored in higher level caches
When a higher level cache has a key, refresh the lower level keys and only overwrite if the force option is supplied
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In a distributed environment, multiple instances could write to cache at once. This option determines what should happen if an exiting entry is found in a higher level cache.