Method constructor

tfjs-data/src/iterators/lazy_iterator.ts:935–940

(
      iterators: LazyIterator<LazyIterator<T>>,
      private readonly baseErrorHandler?: (e: Error) => boolean)

  private moreIterators: LazyIterator<LazyIterator<T>>;

  constructor(
      iterators: LazyIterator<LazyIterator<T>>,
      private readonly baseErrorHandler?: (e: Error) => boolean) {
    super();
    this.moreIterators = iterators;
  }

  summary() {
    const upstreamSummaries = 'TODO: fill in upstream of chained summaries';