Exception on lib_round

[Beninho]

lib_round accept number AND list parameters.
Your lib_round function throw an exception when argument is a list

if ($arg[0] == "list") {
    $value = $this->assertNumber($arg[2][0]);
    $decimalPlaces = $this->assertNumber($arg[2][1]);
    return array("number", round($value, $decimalPlaces), $arg[2][0][2]);
} else {
    $value = $this->assertNumber($arg);
    return array("number", round($value), $arg[2]);
}