message: Fix Range::SetFromJson -- was not testing undefined correctly
diff: @@ -701,7 +701,7 @@ export class Range1d extends RangeBase {
  let value;
  for (value of json) {
  const v = value;
  - if (v)
  + if (v !== undefined)
  this.extendX(v);
  }
  } else if (json.low && json.low && json.high && json.high) {
  