58338 2011-04-12 09:41:01 -0700 ToObject should throw a TypeError on null and undefined 2011-07-20 19:19:01 -0700 1 1 1 Unclassified WebKit JavaScriptCore 528+ (Nightly build) All All RESOLVED DUPLICATE 64250 ES5 P2 Normal --- 1 arv webkit-unassigned barraclough erights kangax oliver oldest_to_newest 384072 0 arv 2011-04-12 09:41:01 -0700 The following code snippet should throw a TypeError exception but it returns the global object instead. ({}).valueOf.call(null) 15.2.4.4 Object.prototype.valueOf ( ) ... 1. Let O be the result of calling ToObject passing the this value as the argument. 9.9 ToObject ... Argument Type Result Undefined Throw a TypeError exception. Null Throw a TypeError exception. The same problem occurs in other places like Array.prototype.slice.call(undefined) etc. 417339 1 erights 2011-06-08 10:41:14 -0700 Should this be merged with https://bugs.webkit.org/show_bug.cgi?id=51097 ? 440193 2 barraclough 2011-07-20 19:19:01 -0700 *** This bug has been marked as a duplicate of bug 64250 ***