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PMH / cmmtalk-ye2000 / slide14.htm 

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    <H2>Cache options</H2>
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      <TD>buckets/bucketsize (13/1024)
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      <TD>Size of cache
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      <TD>pagesize (1024)
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      <TD>Aligns buckets to page boundaries for efficiency
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      <TD>strings (0)
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      <TD>Treat cache entries as strings, rather than references
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      <TD>read/write/delete (undef)
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      <TD>Code refs for fetching/updating the underlying data
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      <TD>context (undef)
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      <TD>Passed to the read/write/delete routines to provide context
  
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      <TD>May be altered after <code>new()</code>
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      <TD>permissions (0777)
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      <TD>File creation permissions
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      <TD>cache_negative (0)
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      <TD>Whether to cache entries not found in underlying data
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      <TD>writethrough (1)
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      <TD>Whether to write underlying data as <code>write()</code> is called or when dirty entries are pushed out of the cache
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      <TD>expiry (0)
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      <TD>How long entries should stay in the cache in seconds
  
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      <TD>0: Never expire
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