* properly handle .mount unit state tracking when two mount points are stacked one on top of another on the exact same mount point.
-* ellipsize_mem must take into account multi-byte unicode characters, and
- - make the resulting line the requested number of *characters*, not *bytes*,
- - avoid truncuating multi-byte sequences in the middle.
-
* When we detect invalid UTF-8, we cant't use it in an error message:
log...("Path is not UTF-8 clean, ignoring assignment: %s", rvalue);