Finally got my last #emberjs app that was having trouble upgrading, upgrading again. I was off the beaten path with a third-party test addon and a pre-1.0 UI library: removed both and upgrades work.
The challenges were okay when I was actively developing them, but now that they're in maintenance mode I just want smooth upgrades to keep them running. Sticking as close as possible to "stock" Ember is the way to go.
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