What does the undocumented switch, `-t`, do for the `mdutil` utility?
My educated guess is that mdutil -t /path/to returns the TRUE absolute path of a file or folder.
For example:

$ diskutil -t /this/is/a/real/path
/this/is/a/real/path


When creating a symlink

$ cd /this/is/a
$ ln -s /this/is/a/real/path /this/is/a/symlink
$ mdutil -t /this/is/a/symlink
/this/is/a/real/path


And when using a relative path

$ cd /this/is/a
$ mdutil -t real/path
/this/is/a/real/path


This behavior is almost identical without using the -t flag, except for the trailing : after the pathname.

$ mdutil /this/is/a/real/path
/this/is/a/real/path:


But when using a non existing path with -t, it gives a message and not an error.

$ mdutil -t /this/is/a/nonexisting/path
Unable to resolve path

$ mdutil /this/is/a/nonexisting/path
Error: invalid path `/this/is/a/nonexisting/path'.