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<?php function sum(Number $left = null, Number $right = null) { try { return new Number($left->getValue() + $right->getValue()); } catch (\Error $e) { return new Number(0); } } class Number { private $value; public function __construct($value) { $this->value = $value; } public function getValue() { return $this->value; } } sum(new Number(8), null);
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