bug(od): when $'\xff' the tools hangs while the gnu one rejects it with an error

[HackingRepo]

Hi, uutils mainteners

it is very weird when using a character like $'\xff' that prohbited in UTF8, the uutils old hangs not errors out

relunsec@relunsec:~/software/coreutils/target/debug$ ./od $'\xff'

as you can see the gnu does not

relunsec@relunsec:~/software/coreutils/target/debug$ gnuod $'\xff'
gnuod: ''$'\377': Invalid or incomplete multibyte or wide character
relunsec@relunsec:~/software/coreutils/target/debug$ 

[oech3]

While this is still bug, GNU 9.11 does

$ '/home/a/bin/gnu9.11/od' $'\xff'
od: ''$'\377': Is a directory