Strange addition

 

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// I have a object "CentralProcesser". I can get the user and system usage of the CPU. I want to get the total.
let system: Double = CentralProcesser.current.usage.system // 10.8746757975 or something like that
let user: Double = CentralProcesser.current.usage.user // 23.24123412424 or something like that
// And now I add them together, right?
let total: Double = system + user // nan