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koher 5/6/2020 3:05 PM
これってなんでないんでしたっけ？
3:06 PM
↓でも特に言及されてなさそう？ https://github.com/apple/swift-evolution/blob/master/proposals/0207-containsOnly.md
apple/swift-evolution
This maintains proposals for changes and user-visible enhancements to the Swift Programming Language. - apple/swift-evolution
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