I've discovered, to my dismay, that when you append one AA (roAssociativeArray) to another one, if it finds any same keys it will REPLACE it! Yes, I know that's exactly what it says it will do, so good for it for being literal, but I just figured if it found a nested AA it would nicely Append() it, rather than replace it.
This is what I want, or maybe a different but similar command, such as NestAppend() or something.
As it is, I have to manually deal with this, and for now, thankfully only one layer, so I can go through each key/value in the top AA and Append() each of those one at a time, with a big FOR EACH loop.
The name ".append()" is an unfortunate misnomer. Method should have been named ".update()", because that's what it does: A.append(B) adds (if new) to A - or replaces (if pre-existing) - key-value pairs from B. It is a shorter (and faster) version of: