public function offsetExists($id)
	{
		if ($this->rootContainer) {
			try {
				return $this->rootContainer->has($id);
			} catch (NotFoundException $ex) {
				// Fallback to pimple if offsetExists fails.
				return $this->pimpleContainer->offsetExists($id);
			}
		} else {
			return $this->pimpleContainer->offsetExists($id);
		}
	}