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$obj = MODULE->new({
    param1 => $val1,
    group1 => {
...
        param3 => $val3,
        },
    });

$obj->config({
    group1 => {
        param2 => $val5,
        },
    param4 => $val4,
    });

$obj->param1($val1);
$obj->param2($val2);

#
# Usage:
...
#      DATA2 => "newvalue32",
#      },
# }