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*SVN*
+* Changed the implementation of Enumerable#group_by to use a double array approach instead of a hash such that the insert order is honored [DHH/Marcel]
+
* remove multiple enumerations from ActiveSupport::JSON#convert_json_to_yaml when dealing with date/time values. [rick]
* Hash#symbolize_keys skips keys that can't be symbolized. #10500 [Brad Greenlee]