a change in format.
- The MIDX keeps only one record per object ID. If an object appears
- in multiple packfiles, then the MIDX selects the copy in the most-
- recently modified packfile.
+ in multiple packfiles, then the MIDX selects the copy in the
+ preferred packfile, otherwise selecting from the most-recently
+ modified packfile.
- If there exist packfiles in the pack directory not registered in
the MIDX, then those packfiles are loaded into the `packed_git`