[swift-users] Should Array's `append(_)` function cause `didSet`?

[Zhao Xin via swift-users]

Should Array's `append(_)` functions cause the array's `didSet`?
In my own test, it did call `didSet` in Playground. But in .swift files, it
didn't call.

Is this a known bug or something? Which is correct?

Xcode Version 9.0 beta 2 (9M137d)​

swift --version

Apple Swift version 4.0 (swiftlang-900.0.45.6 clang-900.0.26)

Target: x86_64-apple-macosx10.9



Zhao Xin

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