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> and the docs linked from the email are not updated yet.

That about sums up most things Google does for developers.

I thought the standard advice for Google stuff was "there are always two systems - the undocumented one, and the deprecated one"

That's a wonderful quote that applies to many companies. (I think that will resonate with the Unity developer community right now.)

What I most frequently heard was "There are two solutions: the deprecated one, and the one that doesn't work yet."