system/HTTP/URI.php
public function addQuery(string $key, $value = null)
	{
		$this->query[$key] = $value;

		return $this;
	}
public function addQuery(string $key, $value = null)
	{
		$this->query[$key] = $value;

		return $this;
	}
Adds a single new element to the query vars.

@param string $key
@param mixed  $value

@return $this