Note: the relevant assertion message has changed, and the next assertion-message prompted bug 1682929 to be filed. That bug and this bug here are effectively dupes. I'll dupe this bug forward to the newer bug, since there's been some patch-writing activity over there.
Bug 1502094 Comment 1 Edit History
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Note: the relevant assertion message has changed, and the new assertion-message prompted bug 1682929 to be filed. That bug and this bug here are effectively dupes. I'll dupe this bug forward to the newer bug, since there's been some patch-writing activity over there.