Emcee

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import Foundation
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public final class LoggableDouble: CustomStringConvertible {
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    private let value: Double
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    private let suffix: String
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    public init(_ value: Double, suffix: String) {
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        self.value = value
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        self.suffix = suffix
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    }
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    public var description: String {
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        let string = String(format: "%.3f", value)
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        return [string, suffix].filter { !$0.isEmpty }.joined(separator: " ")
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    }
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}
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extension TimeInterval {
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    public func loggableInSeconds() -> LoggableDouble {
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        loggable(suffix: "sec")
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    }
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    public func loggable(suffix: String) -> LoggableDouble {
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        LoggableDouble(self, suffix: suffix)
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    }
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}
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