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 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.