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Pkl - Configuration that is Programmable, Scalable, and Safe
(pkl-lang.org)
This is a most excellent place for technology news and articles.
Huh? No. This is a really simple tool - you type text into a file, and save that file on your disk. Other things read the file. Thee's no "control" anywhere to be seen.
Apparently Apple has been using Pkl internally for years, and they've decided to do the world a favour by making it publicly available... probably because they want to use it for public projects too, instead of just their internal ones.
I doubt Apple open sourced it to the world as a "favour".