rem: }, 
add:  return null; } 
context:   wrapData: function (aDataObject, aLength, aWidth)    {      const IID = aWidth == 2 ? Components.interfaces.nsISupportsWString :                                Components.interfaces.nsISupportsString;      var data = aDataObject.QueryInterface(IID);      if (data)        return data.data.substring(0, aLength / aWidth);    },
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