public function setArray($key, array $values)
	{
		$this->validateKey($key);
		if (empty($values)) {
			throw new \InvalidArgumentException("Missing value.");
		}
		foreach ($values as $v) {
			$this->validateValue($v);
		}
		$this->params[$key] = [];
		foreach ($values as $v) {
			$this->params[$key][] = $v;
		}
		return $this;
	}