The aggregation framework lacks function for HEX <-> Number conversion and binary operations. Such functions are common in almost every programming language. Typically and most required operations would be: - convert Int/Long to Hex - convert Hex to Int/Long - Create BinData from Hex string - Get Hex string of BinData - Binary AND - Binary OR - Binary XOR - Binary NOT (i.e. complement) Some of these functions are available in mongo shell or in [Bitwise Query Operators](https://www.mongodb.com/docs/manual/reference/operator/query-bitwise/) but they do not exist in aggregation framework. For details see https://jira.mongodb.org/browse/SERVER-55386 This request becomes more urgent, because starting in MongoDB 8.0, server-side JavaScript functions ($accumulator, $function, $where) are deprecated.