ClipView field clipY can't be bound.

Here is a script to reproduce:


import javafx.stage.Stage;
import javafx.scene.Scene;
import javafx.scene.layout.VBox;
import javafx.scene.control.Button;
import javafx.scene.layout.ClipView;
import javafx.animation.Timeline;
import javafx.animation.KeyFrame;
import javafx.animation.Interpolator;

/**
 * @author cy6erGn0m
 */

var y : Number = 0;
var height : Number = 100;
var clipY : Number = 0;

def st : Stage = Stage {
    title: "Centered text"
    scene: Scene {
        width: 250
        height: 200
        content: [
            ClipView {
                translateY: bind y
                width: bind st.scene.width
                height: bind height
                clipY: bind clipY
                pannable: false

                node: VBox {
                    content: [
                        Button {
                            text: "Button 'Hello'"
                            
                            action: function() : Void {
                                Timeline {
                                    repeatCount: 1
                                    keyFrames: [
                                        KeyFrame {
                                            time: 1s
                                            values: [
                                                clipY => 100 tween Interpolator.EASEIN,
                                                y => 10 tween Interpolator.EASEIN,
                                                height => 0 tween Interpolator.EASEIN
                                            ]
                                        }
                                    ]
                                }.play();
                            }
                        }
                    ]
                }
            }
        ]

    }
}


This code generates many many exceptions like this:

Exception in trigger:
com.sun.javafx.runtime.AssignToBoundException: Cannot assign to bound variable
        at com.sun.javafx.runtime.location.FloatVariable.setAsFloat(FloatVariable.java:111)
        at javafx.scene.layout.ClipView.set$clipY(ClipView.fx:66)
        at javafx.scene.layout.ClipView$_SBECL.onChange(ClipView.fx:67)
        at com.sun.javafx.runtime.location.FloatVariable.notifyListeners(FloatVariable.java:146)
        at com.sun.javafx.runtime.location.FloatVariable.replaceValue(FloatVariable.java:94)
        at com.sun.javafx.runtime.location.AbstractBindingExpression.pushValue(AbstractBindingExpression.java:94)
        at com.sun.javafx.runtime.location.FloatVariable$1.compute(FloatVariable.java:104)
        at com.sun.javafx.runtime.location.AbstractVariable.update(AbstractVariable.java:128)
        at com.sun.javafx.runtime.location.AbstractVariable.ensureValid(AbstractVariable.java:163)
        at com.sun.javafx.runtime.location.FloatVariable.getAsFloat(FloatVariable.java:177)
        at javafx.scene.layout.ClipView$_SBECL.compute(ClipView.fx:208)
        at com.sun.javafx.runtime.location.AbstractVariable.update(AbstractVariable.java:128)
        at com.sun.javafx.runtime.location.AbstractVariable.invalidate(AbstractVariable.java:142)
        at com.sun.javafx.runtime.location.AbstractLocation$2.onAction(AbstractLocation.java:234)
        at com.sun.javafx.runtime.location.AbstractLocation$2.onAction(AbstractLocation.java:228)
        at com.sun.javafx.runtime.location.AbstractLocation.iterateChildren(AbstractLocation.java:181)
        at com.sun.javafx.runtime.location.AbstractLocation.invalidateDependencies(AbstractLocation.java:254)
        at com.sun.javafx.runtime.location.AbstractLocation.invalidate(AbstractLocation.java:108)
        at com.sun.javafx.runtime.location.AbstractVariable.invalidate(AbstractVariable.java:140)
        at com.sun.javafx.runtime.location.AbstractLocation$2.onAction(AbstractLocation.java:234)
        at com.sun.javafx.runtime.location.AbstractLocation$2.onAction(AbstractLocation.java:228)
        at com.sun.javafx.runtime.location.AbstractLocation.iterateChildren(AbstractLocation.java:181)
        at com.sun.javafx.runtime.location.AbstractLocation.invalidateDependencies(AbstractLocation.java:254)
        at com.sun.javafx.runtime.location.FloatVariable.notifyListeners(FloatVariable.java:140)
        at com.sun.javafx.runtime.location.FloatVariable.replaceValue(FloatVariable.java:94)
        at com.sun.javafx.runtime.location.FloatVariable.setAsFloat(FloatVariable.java:113)
        at com.sun.javafx.runtime.Pointer.set(Pointer.java:145)
        at javafx.animation.Timeline.doInterpolate(Timeline.fx:898)
        at javafx.animation.Timeline.doInterpolate(Timeline.fx:898)
        at javafx.animation.Timeline.process(Timeline.fx:844)
        at javafx.animation.Timeline.process(Timeline.fx:844)
        at javafx.animation.Timeline$1TimingTargetAdapter$anon1.timingEvent(Timeline.fx:1046)
        at javafx.animation.Timeline$1TimingTargetAdapter$anon1.timingEvent(Timeline.fx:1046)
        at com.sun.scenario.animation.Clip.fireTimingEvent(Clip.java:929)
        at com.sun.scenario.animation.Clip.process(Clip.java:919)
        at com.sun.scenario.animation.Clip.timePulse(Clip.java:887)
        at com.sun.scenario.animation.AbstractMasterTimer.process(AbstractMasterTimer.java:470)
        at com.sun.scenario.animation.AbstractMasterTimer.timePulseImpl(AbstractMasterTimer.java:376)
        at com.sun.scenario.animation.AbstractMasterTimer$MainLoop.run(AbstractMasterTimer.java:274)
        at com.sun.embeddedswing.EmbeddedEventQueue.doPulse(EmbeddedEventQueue.java:562)
        at com.sun.embeddedswing.EmbeddedEventQueue.access$000(EmbeddedEventQueue.java:74)
        at com.sun.embeddedswing.EmbeddedEventQueue$2.run(EmbeddedEventQueue.java:465)
        at java.awt.event.InvocationEvent.dispatch(Unknown Source)
        at java.awt.EventQueue.dispatchEvent(Unknown Source)
        at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
        at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
        at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
        at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
        at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
        at java.awt.EventDispatchThread.run(Unknown Source)