following constructs: typeof o.p, if (o.p), if (!o.p), if (o.p == undefined), if (undefined == o.p) git-svn-id: svn://10.0.0.236/trunk@233515 18797224-902f-48f8-a5cc-f745e15eee43
following constructs: typeof o.p, if (o.p), if (!o.p), if (o.p == undefined), if (undefined == o.p) git-svn-id: svn://10.0.0.236/trunk@233515 18797224-902f-48f8-a5cc-f745e15eee43