Returns a random float between 0 and 1 each time it is called.
4.4.2
https://docs.mongodb.com/manual/reference/operator/aggregation/rand/#mongodb-expression-exp.-rand
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Returns a random float between 0 and 1 each time it is called.
4.4.2
https://docs.mongodb.com/manual/reference/operator/aggregation/rand/#mongodb-expression-exp.-rand