I have a question though -- since this still adds an attribute to the CalendarEventMixin under the hood, do we still have the problem that a Kind can't be modified once instances of it have been created? You couldn't create a bunch of CalendarEvents in your repository and then later add in 'foreign' (or whatever we're calling them) attributes to that Kind, right? I realize this is nothing new, I just wanted to verify my understanding.
The core schema sure supports it. You can add an attribute to a Kind at any time, even when items of that kind exist already. What is not done at the moment is setting a possible initial value for that new attribute on these existing items.
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