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* Cache clearing follows the rules of includes/cache.inc.
* Cache files can contain multiple cache entries that share same MD5 of their cid:s. This way it's certain that cache entries will not be lost by accident and sessions can be safely stored in cache.
* New .meta files that correspond to cache files and contain cid and expire. These files allow multiple cache entries in a cache file to be faster on cache_set and clearing cache to be faster too.