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*SVN*
+* Added calculations: Base.count, Base.average, Base.sum, Base.minimum, Base.maxmium, and the generic Base.calculate. All can be used with :group and :having. Calculations and statitics need no longer require custom SQL. #3958 [Rick Olson]. Examples:
+
+ Person.average :age
+ Person.minimum :age
+ Person.maximum :age
+ Person.sum :salary, :group => :last_name
+
* Renamed Errors#count to Errors#size but kept an alias for the old name (and included an alias for length too) #3920 [contact@lukeredpath.co.uk]
* Reflections don't attempt to resolve module nesting of association classes. Simplify type computation. [Jeremy Kemper]