Server side, MongoDB will log out the first user when a second authentication is issued for the same database. In the past we've handled this by just quietly updating the authentication credentials we have stored for that db. The driver spec for auth now requires that we raise an explicit exception so that users don't unknowingly log out previous authentications applied to the database.
[ RUBY-563 ]
* Calling BSON::ObjectId.from_string with a BSON::ObjectId segfaulted * C function attempted to use BSON::ObjectId as a String * Adds separate check/exception for non-String arguments