Bogus error with too many CLI arguments

[salfers]

Run: mtr -r 1 2001:db8::babe

(of course I merely forgot the -c here)

Expected behavior

mtr reports an error that I need to give it exactly one hostname.

Actual behavior

it tries to ping 0.0.0.1 for a while and prints:

Start: 2024-11-07T12:12:25+0100
HOST: localhost                 Loss%   Snt   Last   Avg  Best  Wrst StDev
mtr: Failed to resolve host: 2001:db8::babe: Address family for hostname not supported

[yvs2014]

that I need to give it exactly one hostname

you can give more than one but the same IP family only (either inet4 or inet6), at least in current implementation
test out with mtr -r 0 1 1.1.1.1 8.8.8.8 or mtr -r ::1 ::1

[salfers]

I see. However that seems to be undocumented.