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    }
    return;
}

sub cv_external{
    my($cv) = @_;
    return $cv->XSUB || $external{ ${$cv} };
}

sub ddx{
    require Data::Dumper;
    my $ddx = Data::Dumper->new(@_);
    $ddx->Indent(1);
    $ddx->Terse(TRUE);
    $ddx->Quotekeys(FALSE);
    $ddx->Useqq(TRUE);
    return $ddx if defined wantarray;

    my $name = ( split '::', (caller 2)[3] )[-1];
    print STDERR $name, ': ', $ddx->Dump(), "\n";
    return;
}
sub dump_object{
    ddx([[ map{ $_ ? $_->object_2svref : $_ } @_ ]]);
}

sub dump_value{
    ddx([\@_]);
}


sub dump_stack{
    require Data::Dumper;
    no warnings 'once';

    local $Data::Dumper::Indent    = 0;
    local $Data::Dumper::Terse     = TRUE;
    local $Data::Dumper::Quotekeys = FALSE;
    local $Data::Dumper::Useqq     = TRUE;

    deb "(%s)\n", join q{,}, map{
        # find variable name
        my $varname = '';
        my $class   = $_->class;

        if($class eq 'SPECIAL'){
            ($varname = $_->special_name) =~ s/^\&PL_//;
            $varname;
        }