public function dump() {
		$s = '';
		for ( $i = 0; $i < $this->length(); $i++ ) {
			$item = $this->item( $i );
			$s .= "$i. " . $item->getDebugTag();
			if ( $i === $this->length() - 1 && $item !== $this->current ) {
				$s .= " CURRENT POINTER INCORRECT";
			}
			$s .= "\n";
		}
		return $s;
	}