For some reason I hadn't thought to try a hex dump.
No underline:
% echo hello | hexdump -C
00000000 68 65 6c 6c 6f 0a |hello.|
00000006
With 'ul':
%echo hello | ul | hexdump -C
00000000 68 65 6c 6c 6f 0a |hello.|
00000006
With ANSI escape codes:
% echo -e "\033[38mhello\033[39m" | hexdump -C
00000000 1b 5b 33 38 6d 68 65 6c 6c 6f 1b 5b 33 39 6d 0a
|.[38mhello.[39m.|
00000010
...if 'ul' was doing anything, it'd be different from the first
example, but it's the same.
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