echo is ignoring -- char

[sylvestre]

trafficstars

With our:

./target/debug/coreutils echo -- 'foo'
foo

with GNU:

 /usr/bin/echo  -- 'foo'
-- foo

Tested by tests/misc/echo.sh

[sudhackar]

I took a look at this clap doesn't support this AFAIK. So I opened a discussion here : https://github.com/clap-rs/clap/discussions/5305