Get rid of the split semantics, use start & len #13
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While the split semantics can help you partition the disk without overlaps it's mostly annoying because you usually either have a pair of start and end (or last) sectors, or a start sector and a length.
There is a regression of sorts in mirage-block-partition-mbr as we no longer check for overlapping partitions or partitions that include the MBR itself. It could be added back, but I suspect there are not any users of this code. So maybe better to just remove it altogether?!