message: Unnecessary instanceof check.
diff: @@ -10,7 +10,6 @@ import {
  Loop,
  Path,
  CurveChain,
  - GrowableXYZArray,
  Point3d,
  StrokeOptions,
  Angle,
  @@ -124,15 +123,13 @@ export class PrimitivePathGeometry extends Geometry {
  private static collectCurveStrokes(strksPts: StrokesPrimitivePointLists, loopOrPath: CurveChain, facetOptions: StrokeOptions, trans: Transform) {
  const strokes = loopOrPath.getPackedStrokes(facetOptions);
  - if (strokes) {
  - if (strokes instanceof GrowableXYZArray) {
  + if (undefined !== strokes) {
  const pts = strokes.getPoint3dArray();
  trans.multiplyPoint3dArrayInPlace(pts);
  strksPts.push(new StrokesPrimitivePointList(0, pts));
  }
  }
  }
  -}
  export class PrimitivePointStringGeometry extends Geometry {
  public readonly pts: Point3d[];
  