context:     getFrameKeys: function(frame, names)    {        var listValue = {value: null}, lengthValue = {value: 0};        frame.scope.getProperties(listValue, lengthValue);            for (var i = 0; i < lengthValue.value; ++i)        {            var prop = listValue.value[i];            var name = prop.name.getWrappedValue();            names.push(name);        }        return names;    },
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