protected function is_linear_whitespace()
	{
		return (bool) ($this->data[$this->position] === "\x09"
			|| $this->data[$this->position] === "\x20"
			|| ($this->data[$this->position] === "\x0A"
				&& isset($this->data[$this->position + 1])
				&& ($this->data[$this->position + 1] === "\x09" || $this->data[$this->position + 1] === "\x20")));
	}