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Cache options

. buckets/bucketsize (13/1024)
. Size of cache
. pagesize (1024)
. Aligns buckets to page boundaries for efficiency
. strings (0)
. Treat cache entries as strings, rather than references
. read/write/delete (undef)
. Code refs for fetching/updating the underlying data
. context (undef)
. Passed to the read/write/delete routines to provide context
. May be altered after new()
. permissions (0777)
. File creation permissions
. cache_negative (0)
. Whether to cache entries not found in underlying data
. writethrough (1)
. Whether to write underlying data as write() is called or when dirty entries are pushed out of the cache
. expiry (0)
. How long entries should stay in the cache in seconds
. 0: Never expire

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