message: perf(docs-infra): avoid unnecessary JSON parsing in `ScrollService`
  PR Close
diff: @@ -171,13 +171,16 @@ export class ScrollService {
  if (this.supportManualScrollRestoration) {
  const currentScrollPosition = this.viewportScroller.getScrollPosition();
  this.location.replaceState(this.location.path(true), undefined, {scrollPosition: currentScrollPosition});
  - window.sessionStorage.setItem('scrollPosition', currentScrollPosition.toString());
  + window.sessionStorage.setItem('scrollPosition', currentScrollPosition.join(','));
  }
  }
  getStoredScrollPosition(): ScrollPosition | null {
  const position = window.sessionStorage.getItem('scrollPosition');
  - return position ? JSON.parse('[' + position + ']') : null;
  + if (!position) { return null; }
  +
  + const [x, y] = position.split(',');
  + return [+x, +y];
  }
  removeStoredScrollPosition() {
  