'echo' does not ignore other arguments with --help or --version

[Benno Schulenberg]

Hi,

Most of the coreutils tools will ignore all other arguments 
when --help or --version is given, but not 'echo':

$ /bin/echo --help ignore this
--help ignore this

$ /bin/echo --version ignore this
--version ignore this

But it says that it would:

$ /bin/echo --help | grep help
      --help     display this help and exit

$ /bin/echo --version | head -n1
echo (GNU coreutils) 6.12

Benno