add:  if (!(v instanceof jsdIValue)) throw BadMojo (ERR_INVALID_PARAM, "v", String(v));  
context: function displayProperties (v){    if (!v)        throw BadMojo (ERR_REQUIRED_PARAM, "v");        var p = new Object();    v.getProperties (p, {});    for (var i in p.value) display(formatProperty (p.value[i]));}
meta: 9421	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/9421/d12d03516bd59a22f2ebe0f3126ee49514553a22/venkman-debugger.js/buggy/extensions/venkman/resources/content/venkman-debugger.js