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omochimetaru 4/20/2021 2:14 PM
This maintains proposals for changes and user-visible enhancements to the Swift Programming Language. - apple/swift-evolution
2:14 PM
unsafelyUnwrapped の利用例こんなところで見つけた
2:15 PM
However, in optimized builds (-O), no check is performed to ensure that the current instance actually has a value.
-O でさえチェックコストが消えるらしい。