RWO now has some coverage of this:
https://dev.realworldocaml.org/variants.html
It’s in the end of the opening section.
y
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FYI, for reasons I can’t explain, DNS will not currently resolve the dev.realworldocaml.org address. 
Odd. I can see it fine. @avsm has been doing some DNS migrations, so I’m sure that’s related.
The DNS now resolves okay.
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I’ve been doing some shuffling to move some of the infrastructure to GitHub Pages’ new Letsencrypt hosting. It should be stable now; please let me know if not.
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BTW, I think opinions on phrasing this have stabilized enough that a pull request to the main documentation would probably be appropriate now. Anyone disagree?