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DBM-style interface to a directory.

Each key is stored as a single file.  This is not expected to be very fast or
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DirDBMs are *not* thread-safe, they should only be accessed by one thread at
a time.

No files should be placed in the working directory of a DirDBM save those
created by the DirDBM itself!

Maintainer: Itamar Shtull-Trauring
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    A directory with a DBM shelf interface.

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#

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