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Type:
Task
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Resolution: Done
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Priority:
Major - P3
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Affects Version/s: None
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Component/s: Aggregation Framework
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Undefined is a valid data type and shouldn't be used for missing values. I know it is used as such in ExpressionFieldPath and ExpressionObject.
@Matt: could you search for any other uses of Undefined BSONType and see how feasible this is?