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Question: this only affects Rails Version 2 and higher, right?

I suspect I'm not the only person out there with legacy Rails Version 1 sites, so it would be very good to know the answer to that!

Note the comment about Yaml parsing in 1.1 era rails apps. You'll want to at least look into what your app is doing.

Yeah - my eventual decision was that it wasn't worth the risk. One extremely busy day later, we don't have any active Rails apps.

That is correct