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Utility to get and set the kernel state at runtime, features:
* get or set the system state at runtime,
* handle an object up to CTL_MAXNAME levels,
* print the right object also with an empty level name,
* options to show the properties of a parameter,
* output explicitly indicated by the options,
* options not mutually exclusive,
* output via libxo in human and machine readable formats,
* isolated code to manage opaque values,
* some string value is parsed to show structured output,
* avoid non-primitive data types hardcode via libnv,
* debug without recompiling the kernel with SYSCTL_DEBUG.
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