One of the best features I've run across in these types of tools is the ability to remember the anonymizations that were applied to a message. For example, you would define the MRN and Encounter Number fields as key fields for an HL7 message type and whatever transformations were applied to the first message with those keys will be applied to any of them that follow. It is certainly a non-trivial feature to implement, but it gives you the ability to keep a patient encounter intact as the visit goes from admit to discharge. This scares out a lot of problems before go-live.

Regardless, nice work and thank you for your efforts.

Done. Issue 969 opened. Thanks for the collaboration!

Wow, good eye on that. Yes, that pattern holds true: