Based on the different behavior of these 2 commands, it appears that 'v' is an undocumented switch, so it would be great if F1 help could tell us what -v does.
/echo -jkopuwxyz
/echo -jkopuvwxyz
If -v turns out to be a 'do nothing switch letter that will never be used as a valid switch' as referenced
HERE that would also be helpful if it were documented.
