Github user aledsage commented on the issue:
Thanks @ahgittin - finished reviewing.
Overall I'm happy with this. I agree that it feels very complicated (and
some of the code is quite subtle, so could do with a more thorough review!).
Are there situations (such as the `NOT_REINHERITABLE`
app->child->grandchild) that are not tested?
I'm fine with this being merged when you're ready.
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