+
Note that commits that do not include the trailer will not be counted.
Likewise, commits with multiple trailers (e.g., multiple signoffs) may
-be counted more than once.
+be counted more than once (but only once per unique trailer value in
+that commit).
+
The contents of each trailer value are taken literally and completely.
No mailmap is applied, and the `-e` option has no effect (if the trailer