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This fixes issues on macOS 10.14.x (Mojave) and earlier as system_profiler does not offer
-json
option until 10.15.x (Catalina).I would assume usage on 10.14.x and earlier will be less than 10.15.x so I thought it'd be best to leave the json parsing in rather than switch entirely to xml. Could also have conditions depending on macOS version detected but current method in this PR seemed more straightforward.