message: mark matches optional in queryAll
diff: @@ -437,7 +437,7 @@ export function query(node: Node, predicate: Predicate): Node|null {
  * Equivalent to `nodeWalkAll`, but only matches elements
  */
  export function queryAll(
  - node: Node, predicate: Predicate, matches: Node[]): Node[] {
  + node: Node, predicate: Predicate, matches?: Node[]): Node[] {
  const elementPredicate = AND(isElement, predicate);
  return nodeWalkAll(node, elementPredicate, matches);
  }
  