Existing Java implementation is available here:

https://github.com/folio-org/mod-meta-storage/blob/master/server/src/main/java/org/folio/metastorage/server/MatchKey.java

Implementation notes

Once MODSI-36 is completed, re-implement the GR algorithm in JS. The reason is that the algorithm receives a lot of tweaks over time and the Java implementation is not flexible enough as it would require rolling out new MetaStorage releases each time it changes.

The implementation needs to be modified to work with Marc-in-Json format rather than Folio Inventory format. This is to ensure that Folio Inventory is not required as a stored payload.