Calculates and returns the collective sum of numeric values. $sum ignores non-numeric values.
5.0
https://docs.mongodb.com/manual/reference/operator/aggregation/sum/#mongodb-expression-exp.-sum
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Calculates and returns the collective sum of numeric values. $sum ignores non-numeric values.
5.0
https://docs.mongodb.com/manual/reference/operator/aggregation/sum/#mongodb-expression-exp.-sum