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<bikeshed> It feels off to call things like Array part of any library when you have array literal syntax `let oddNumbers = [1, 3, 5, 7, 9, 11, 13, 15]`

I'd call that a language feature. Or maybe with Swift there is a blurry line between the two?

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Array is defined in the Swift standard library, but the compiler knows about the type directly, and also recognizes various @_semantics("array.blah") annotations that appear in the standard library source code. I believe the semantics annotations are primarily to help the optimizer.

https://github.com/apple/swift/blob/main/stdlib/public/core/...

Arrays are part of the Swift standard library. Foundation is another library that provides access to things like I/O, networking, calendars, etc.

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