Returns the number of UTF-8 code points in a string.
3.4
https://docs.mongodb.com/manual/reference/operator/aggregation/strLenCP/#mongodb-expression-exp.-strLenCP
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Returns the number of UTF-8 code points in a string.
3.4
https://docs.mongodb.com/manual/reference/operator/aggregation/strLenCP/#mongodb-expression-exp.-strLenCP