• cloudevents diff should fail if expected is not found in the diff even for --ignore-additional
• cloudevents diff want got should keep searching for a valid pass for each want in got. At the moment it tests and fails on the first match based on --find, but got could have more than one match.
• cloudevents diff want got should mark got's list as "used" as it works through all the wants.

the third point is interesting. It is not clear how much shuffling we really want to produce. It is a bit of the greedy matching problem in regex.