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by cableshaft 1320 days ago
Good guess, but I think I found what it actually was: Toll-Free Bridging[1]. Basically how you can use many Core Foundation types and NeXTSTEP classes interchangeably, like CFLocaleRef and NSLocale.

Never really had to use it myself, at least IIRC, but I was aware of the concept generally. But because I didn't answer by saying 'Toll-Free Bridging', I was done.

[1]: https://developer.apple.com/library/archive/documentation/Ge...