Returns an array of all unique values that results from applying an expression to each document in a group.
5.0
https://docs.mongodb.com/manual/reference/operator/aggregation/addToSet/#mongodb-expression-exp.-addToSet
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Returns an array of all unique values that results from applying an expression to each document in a group.
5.0
https://docs.mongodb.com/manual/reference/operator/aggregation/addToSet/#mongodb-expression-exp.-addToSet