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Add a new option - like ArgumentParser.add_argument.
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Find the correct Option for a given bootarg (if one exists)
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Parse the boot cmdline and create an appropriate Namespace instance
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by default (/proc/cmdline, /run/initramfs/etc/cmdline, /etc/cmdline).
If an option requires a value but the boot arg doesn't provide one,
we'll quietly not set anything in the Namespace. We also skip any boot options
that were not specified by add_argument as we don't care about them
(there will usually be quite a lot of them (rd.*, etc.).
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