A class cast exception when upgrading from GWT 2.8.0 to 2.8.2 ?

I just upgraded from GWT 2.8.0 to 2.8.2 and get a class cast exception which I don't understand, please some help.

It goes wrong in the following line of code:

ZtoeslagAppConfig this.bla = new JsoZtoeslagAppConfig(getZtoeslagConfig());

All relevant code:

private <T extends JavaScriptObject & ZtoeslagAppConfig> T getZtoeslagConfig() {

return (T) UtilsJsni.getProperty(getJson(), getMiscValues().zorgtoeslag());

}

private JavaScriptObject getJson() {

return this.json;

}

public interface ZtoeslagAppConfig {

AppPage[] getPages();

}

public final class JsoZtoeslagAppConfig  implements ZtoeslagAppConfig {

private final JavaScriptObject jsoConfig;

public <T extends JavaScriptObject & ZtoeslagAppConfig> JsoZtoeslagAppConfig(final T jsoConfig) {

        super(jsoConfig);

}

public AppPage[] getPages() {

return UtilsJsArrays.toArray(getJsoPages());

}

private JsArray<? extends JsoAppPage> getJsoPages() {

return UtilsJsni.getPropertyAsArray(getJsoConfig(), getMiscValues().pages());

}

private JavaScriptObject getJsoConfig() {

return this.jsoConfig;

}

}

During super dev mode, in Chrome the values of this.json above:

json_1_g$:

 newsletter: "825eceb44f"

 zorgtoeslag: {payments: Array(3), pages: Array(3)} 

Just before calling the constructor in: 

new JsoZtoeslagAppConfig(getZtoeslagConfig());

It is calling a gwt method for casting that seems to fail:

 static Object castTo(Object src, JavaScriptObject dstId) {

    checkType(src == null || canCast(src, dstId));

In this method, I see that dstId has the value 1891, and src is some json value.

When performing the above body it calls the following method, that I don't directly understand as I don't see the method call in the above function:

  static native boolean jsEquals(Object a, Object b) /*-{

    return a == b;

  }-*/;

I think this method fails as a is some json and b has the value null.

What goes wrong here? 

    

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