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Of course, you should use a development system and a copy of your real configuration whenever testing. If you run into any problems, you are encouraged to file bugs at https://issues.shibboleth.net/
You should keep in mind that even if snapshots are intended to be stable, they may include uncompleted features and new files that may not appear in the final release, so while it is generally safe to upgrade a snapshot to the final release, that is not advised.