And then there are layering technologies like LVM and loopback.
They should be included in a discovery, but if you limit yourself
to one "device type", there's no place for them.
> For example a disk may belong, at the same time, to the "scsi",
> "disk" and "scsi-disk" device classes [...]
True, but in a sane system, "scsi" + "disk" implies "scsi-disk".
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