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XXX TO DO:

- seems to contain a bug when updating...

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items is never reused)

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Open the database file, filename, and return corresponding object.

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    other DBM implementations, is ignored in the dbm.dumb module; the
    database is always opened for update, and will be created if it does
    not exist.

    The optional mode argument is the UNIX mode of the file, used only when
    the database has to be created.  It defaults to octal code 0o666 (and
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