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Vincent Pelletier authored
Make possible to have infinite cache (still limited to zope scope, will get flushed when zope is restarted) by allowing to specify None as a duration. git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@9047 20353a03-c40f-0410-a6d1-a30d3c3de9de
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