Things like bugzilla:33226 can also be fixed with a new version (maybe before that, but I am not sure, if that is a breaking change)
Talk:Requests for comment/API roadmap/Naming Cleanup
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looks like it is, tracking it with bug 38891
One more reason to kill the existing XML format.
Json looks not better, because null is not used in json, when I have looked right.
So setting a empty list as minimum from the server side should be done always.
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