In strict mode, ScriptableObject.putImpl(Object,int,Scriptable,Object) prematurely breaks on !isExtensible, setters don't get a chance to be called

[stijnkliemesch]

Executing the following code:

public static void main(String[] cmdlineArgs) {
    final Context context = ContextFactory.getGlobal().enterContext();
    try {
        final Script compiledScript = context.compileString(""
                + "\"use strict\";\n"
                + "var a = function(){this._x = 2;};\n"
                + "Object.defineProperty(a.prototype, \"x\", {get:(function x() {return this._x;}), set:(function x(x) {this._x = x;})});\n"
                + "Object.freeze(a.prototype);\n"
                + "var b = new a();\n"
                + "var c = b.x;\n"
                + "b.x = 1;\n"
                + "b.x+c;",
                "eval", 1, null
        );
        ScriptableObject global = context.initSafeStandardObjects();
        final Object obj
                = ScriptRuntime.doTopCall(
                        (Context cx, Scriptable scope, Scriptable thisObj, Object[] args) -> compiledScript.exec(context, scope),
                        context, global, null, new Object[]{}, true);
        System.out.println(obj);
        int i = 0;
    } finally {
        Context.exit();
    }
}

Expected output is:

 3.0

instead, this results in a thrown Exception

Exception in thread "main" org.mozilla.javascript.EcmaError: TypeError: Cannot add properties to this object because extensible is false. (eval#7)
    at org.mozilla.javascript.ScriptRuntime.constructError(ScriptRuntime.java:4251)
    at org.mozilla.javascript.ScriptRuntime.constructError(ScriptRuntime.java:4229)
    at org.mozilla.javascript.ScriptRuntime.typeError(ScriptRuntime.java:4262)
    at org.mozilla.javascript.ScriptRuntime.typeError0(ScriptRuntime.java:4268)
    at org.mozilla.javascript.ScriptableObject.putImpl(ScriptableObject.java:2813)
    at org.mozilla.javascript.ScriptableObject.put(ScriptableObject.java:521)
    at org.mozilla.javascript.IdScriptableObject.put(IdScriptableObject.java:479)
    at org.mozilla.javascript.ScriptableObject.putProperty(ScriptableObject.java:2507)
    at org.mozilla.javascript.ScriptRuntime.setObjectProp(ScriptRuntime.java:1743)
    at org.mozilla.javascript.ScriptRuntime.setObjectProp(ScriptRuntime.java:1737)
    at org.mozilla.javascript.gen.eval_1._c_script_0(eval:5)
    at org.mozilla.javascript.gen.eval_1.call(eval)
    at org.mozilla.javascript.gen.eval_1.exec(eval)
...
    at org.mozilla.javascript.ContextFactory.doTopCall(ContextFactory.java:412)
    at org.mozilla.javascript.ScriptRuntime.doTopCall(ScriptRuntime.java:3561)
...

[gbrail]

Thanks!