https://developer.apple.com/library/archive/documentation/Le...
https://en.wikibooks.org/wiki/WebObjects/Overview/Objective-...
Those were the days! Actually kind of amazing that the Foundation framework is the result of steady evolution of an ObjC framework written by NeXT... over 30 years ago? All those `NS` prefixes that are still hanging on are for `NextStep`.
If this really replaces the ObjC implementation... would that be the final sunset of the codebase that has been there (at least ship of theseus style) from NeXTStep days? I wonder if there's continuous version control history of Foundation source from the start, and how many, if any, lines of code remain from the initial implementation.