This is a duplicate of bug 1477063. I think I implemented all that, although there was some reason I never landed it, some regression I have forgotten. There are some tests in part 7 there, and a list of more tests I thought would be appropriate.
Bug 1547520 Comment 1 Edit History
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This is a duplicate of bug 1477063. I think I implemented all the items mentioned in comment 0 here, although there was some reason I never landed it, some regression I have forgotten. There are some tests in part 7 there, and a list of more tests I thought would be appropriate.