This looks interesting, esp. for those who need to do tests either in scripts or programs. Those who don't might still want to be aware that there might be RARE cases of something thinking it's on 10.0, and failing since that's way too old.
https://eclecticlight.co/2020/08/13/macos-version-numbering-isnt-so-simple/ <https://eclecticlight.co/2020/08/13/macos-version-numbering-isnt-so-simple/> I don't think I'm subscribed to macports-dev; so maybe someone that is might want to repost it there.