message: update VertexMap to create and insert key from key constructor params
diff: @@ -67,4 +67,7 @@ function compareVertexKeys(lhs: VertexKey, rhs: VertexKey): number { return lhs.
  export class VertexMap extends SortedArray<VertexKey> {
  public constructor() { super(compareVertexKeys); }
  + public add(position: QPoint3d, fillColor: number, normal?: OctEncodedNormal, uvParam?: Point2d): number {
  + return this.insert(new VertexKey(position, fillColor, normal, uvParam));
  + }
  }
  