* when both sides add a path identically. The resolution
is to add that path.
---prefix=<prefix>/::
+--prefix=<prefix>::
Keep the current index contents, and read the contents
of the named tree-ish under the directory at `<prefix>`.
The command will refuse to overwrite entries that already
- existed in the original index file. Note that the `<prefix>/`
- value must end with a slash.
+ existed in the original index file.
--exclude-per-directory=<gitignore>::
When running the command with `-u` and `-m` options, the