Params::set

public function set(string $paramName, $parameter): self
{
	if ($parameter instanceof MessageParameter)
	{
		$this[$paramName] = $parameter;
	}
	else
	{
		$this[$paramName] = self::create($paramName);
		$this[$paramName]->load($parameter);
	}

	if ($this->getMessageId())
	{
		$this[$paramName]->setMessageId($this->getMessageId());
	}

	return $this;
}