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# Check if there is an option argument available.
if ( $gnu_compat ) {
...
    return (1, $opt, $ctl, $type eq 's' ? '' : 0)
        if $optargtype == 1;  # --foo=  -> return nothing
}

elsif ( defined $rest || @$argv > 0 ) {
    $optargtype = $gnu_compat_strict ? 1 : 3;
}