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f76879ba44
This avoids creating void matchers which have no effect anyway and they just use resources. Also, it makes lvm dumpconfig --type diff to mark these settings properly as not being different from defaults (where by default, devices/preferred_names as well as devices/filter are void). Also, add a few comments about builtin rules used to select device alias in case preferred_names is not defined or it doesn't match any of device aliases.