mitchellh/vagrant — pull request #2925 by fgrehm (2014-02-01 18:08:53+00:00)
Title: Make sure synced folder types are always symbols

This will make sure that third party plugins that define synced folders after this config object has been finalized won't have trouble because of forgetting to use symbols instead of strings. It would have saved me a lot around 2 hours of debugging trying to understand what was going on on https://github.com/fgrehm/vagrant-cachier/issues/76 :-P