So, you know how I was complaining about Ruby not being formally specified. I was very wrong. There's an ISO standard specifying the ruby language:
https://www.iso.org/standard/59579.html
Now since it's behind a paywall (and I haven't spent time trying to access it via the various free ways), I don't know how good it's specified, but clearly someone did.
Of course probably a subset of real ruby, but at least it's close/starting point.
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