Comment #1 on issue 1768 by erik.corry: "delete Math.sin" behavior is not compatible with JSC
http://code.google.com/p/v8/issues/detail?id=1768
This is a deliberate spec violation on V8's part to be compatible with JSC. It seems they have now fixed their implementation, which they previously refused to do because it would break Facebook for Safari users. See http://code.google.com/p/chromium/issues/detail?id=1717 and https://bugs.webkit.org/show_bug.cgi?id=25527
If this change in JSC sticks (ie if Facebook either fixed the site or can be persuaded to fix their site) we should follow.
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