docs: @VisibleForTesting
    static Point createPoint(
        io.opencensus.metrics.export.Point point,
        @javax.annotation.Nullable io.opencensus.common.Timestamp startTimestamp) {
      TimeInterval.Builder timeIntervalBuilder = TimeInterval.newBuilder();
      timeIntervalBuilder.setEndTime(convertTimestamp(point.getTimestamp()));
      if (startTimestamp != null) {
        timeIntervalBuilder.setStartTime(convertTimestamp(startTimestamp));
      }
  
      Point.Builder builder = Point.newBuilder();
      builder.setInterval(timeIntervalBuilder.build());
      builder.setValue(createTypedValue(point.getValue()));
      return builder.build();
    }