message: Eliminate assertions caused by passing elementId instead of [elementId].
diff: @@ -1047,7 +1047,13 @@ export namespace RenderSchedule {
  public addElementTimeline(elementIds: CompressedId64Set | Iterable<Id64String>): ElementTimelineBuilder {
  const batchId = this._obtainNextBatchId();
  let ids: CompressedId64Set;
  +
  + // It's far too easy to accidentally pass a single Id (compiler can't help).
  + if (typeof elementIds === "string" && Id64.isValidId64(elementIds))
  + elementIds = [elementIds];
  +
  if (typeof elementIds === "string") {
  + // Already compressed.
  ids = elementIds;
  } else {
  const sorted = Array.from(elementIds);
  