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