[issue19385] dbm.dumb should be consistent when the database is closed

[Roundup Robot]

Roundup Robot added the comment:

New changeset 95207bcd8298 by Serhiy Storchaka in branch '3.4':
Restore performance of some dumb database methods (regression introduced by #19385).
http://hg.python.org/cpython/rev/95207bcd8298

New changeset 2e59e0b579e5 by Serhiy Storchaka in branch 'default':
Restore performance of some dumb database methods (regression introduced by #19385).
http://hg.python.org/cpython/rev/2e59e0b579e5

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<http://bugs.python.org/issue19385>
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