this is how it looks for me now

    method read($input, :$trim is copy, :$strict is copy,
                        :$skip-header is copy, :$output is copy) {

        my &d = { self.defined ?? $^attr // $^default !! $^default };
        $trim        //= d($!trim,        $trim-default);
        $strict      //= d($!strict,      $strict-default);
        $skip-header //= d($!skip-header, $skip-header-default);
        $output      //= d($!output,      $output-default);

        [...]
    }