So Aurelien and Florian, what do you think? Should we use the hex representation of the UUID and should I keep backward compatibility.
If we can't see any valid reason for converting to ints today, I would personally vote for not converting in the REST API, and for mailman.client to return the UUID object (not the hex string), because I think a python client library should expose python idoms and objects when possible. If we do that, keeping backwards compatibility could be useful indeed, and you can start from my change here: http://bazaar.launchpad.net/~abompard/mailman.client/uuids/revision/58
But FYI, I have already adapted my code in HyperKitty to do the conversion to UUIDs, so I really don't mind if we keep the status quo. Let's just do what's best in the long run.
A.