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by goranmoomin 1120 days ago
Well, Foundation was a mature Obj-C library at that point, Swift’s future was unclear, and Swift needed to have better Obj-C interop anyway.

I think that Foundation being a Obj-C library effectively forced Apple into eating their own dog food (for the sorely needed Swift/Obj-C interop), so I don’t think rewriting Foundation in Swift would have been a good strategy for Apple.