https://github.com/discourse/discourse/pull/4226
Since a timed cookie is a very bad idea, I have done a switch between Session and Permanent. Permanent still default, so no changes for most people.
My use case is enterprise communities, where sharing computers happen very often. People are used to services not persisting trough a browser restart or a computer restart and are posting on each other account 
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Keep in mind we have 100k+ non tech employees 