javafx.scene.shape.Polygon layout bounds is too large if stroke is not null

FULL PRODUCT VERSION :
java version "1.8.0_66"
Java(TM) SE Runtime Environment (build 1.8.0_66-b17)
Java HotSpot(TM) 64-Bit Server VM (build 25.66-b17, mixed mode)

ADDITIONAL OS VERSION INFORMATION :
OS X Yosemite (10.10.5)

A DESCRIPTION OF THE PROBLEM :
For a javafx.scene.shape.Polygon the layout bounds seem to be 0.5 pixels wider (in each direction) than the actually painted polygon area when a stroke is set and the stroke type is either CENTERED or OUTSIDE.

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
The layout bounds should fit the polygon (including its stroke) exactly.
ACTUAL -
There is a 0.5 pixel gap in each direction in case a stroke is set and stroke type is either CENTERED or OUTSIDE.

REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------
package org.eclipse.gef4.fx.examples.snippets;

import javafx.application.Application;
import javafx.scene.Group;
import javafx.scene.Scene;
import javafx.scene.paint.Color;
import javafx.scene.shape.Polygon;
import javafx.scene.shape.Rectangle;
import javafx.scene.transform.Scale;
import javafx.stage.Stage;

/**
 * @author Alexander Nyßen (alexander.nyssen@itemis.de)
 */
public class PolygonLayoutBoundsBug extends Application {

public static void main(String[] args) {
launch(args);
}

@Override
public void start(Stage primaryStage) throws Exception {
final Polygon p = new Polygon(10, 30, 20, 20, 20, 40);
p.setFill(Color.RED);
p.setStroke(Color.BLACK);

final Rectangle r = new Rectangle();
r.setFill(new Color(0, 0, 1, 0.5));
r.setX(p.getLayoutBounds().getMinX());
r.setY(p.getLayoutBounds().getMinY());
r.setWidth(p.getLayoutBounds().getWidth());
r.setHeight(p.getLayoutBounds().getHeight());

Group g = new Group(r, p);
g.getTransforms().add(new Scale(10, 10));
Scene scene = new Scene(g, 500, 500);
primaryStage.setScene(scene);
primaryStage.sizeToScene();
primaryStage.show();
}
}

---------- END SOURCE ----------

CUSTOMER SUBMITTED WORKAROUND :
We have to compensate the layout bounds in all places where we want "tight" bounds.