Use std::nullopt
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@ -645,7 +645,7 @@ struct CmdFlakeArchive : FlakeCommand, MixJSON, MixDryRun
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{
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{
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auto flake = lockFlake();
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auto flake = lockFlake();
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auto jsonRoot = json ? std::optional<JSONObject>(std::cout) : std::optional<JSONObject>();
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auto jsonRoot = json ? std::optional<JSONObject>(std::cout) : std::nullopt;
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StorePathSet sources;
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StorePathSet sources;
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