Thank you, @hube2, this is super helpful and I really appreciate you taking the time to walk me through the internal data structures. I had gleaned a few of these points from your other posts in the forum, but this really pulls it all together.
One last question: are group/field keys stable (e.g., all references to a particular block type attribute/field are identical, regardless of post or block instance w/in a post) or are they dynamic per post/block?
I hope this is useful information for others in the future, and thank you for all you do!
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