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  1. or download this
        $arr= pack("d",1) . pack("d",1.5) . pack("d",3);
  2. or download this
        $arr= pack("d3",1,1.5,3);
  3. or download this
        my @arr= ( 1, 1.5, 3 );
    my $arr= pack "d*", @arr;
    my $res= $obj->Call( $arr, 0+@arr );