Please review wip/p5-MMapDB

Hi,

   Please review wip/p5-MMapDB and send me comments.

  MMapDB implements a database similar to a hash of hashes of hashes, ...,
of arrays of data.

It's main design goals were:
    * very fast read access
    * lock-free read access for massive parallelism
    * minimal memory consumption per accessing process
    * transaction based write access
    * simple backup, compactness, one file

  Its license is perl license.


Regards,
wen

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