NHibernate 3.0: No FirstOrDefault() with QueryOver?

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I have now found out that I could use the Take() extension method on the IQueryOver instance, and only the enumerate to a list, like so:

Result precedingOrMatchingResult = Session.QueryOver<Result>().
        Where(r => r.TimeStamp < timeStamp).
        OrderBy(r => r.TimeStamp).Desc.   
        Take(1).List(). //enumerate only on element of the sequence!
        FirstOrDefault(); //get the preceding or matching result, if there is any

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