[Webkit-unassigned] [Bug 67537] Implement a ProgressEvent constructor for JSC

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=67537





--- Comment #9 from Kentaro Hara <haraken at google.com>  2011-09-06 20:47:17 PST ---
(In reply to comment #8)
> I think I was too hasty, there.  This is what should happen:
> 
> * The literal 18446744073709551615 gets parsed as the JS Number 18446744073709552000.

Cameron: Why do you think that 18446744073709551615 should be parsed as 18446744073709552000?

The ECMA-262 says that the ECMA Number should be the closest double value (Section 8.5: http://www.ecma-international.org/publications/files/ECMA-ST/Ecma-262.pdf). Therefore, toNumber(18446744073709551615) should be 18446744073709551616, since 18446744073709551616=2^64 can be exactly represented as a 64-bit double. In fact, JSValue::toNumber() converts 18446744073709551615 to 18446744073709551616.

On the other hand, as you know, 18446744073709551615 is evaluated in JavaScript as 18446744073709552000 (e.g. alert(18446744073709551615)), but I do not know why this behavior is correct...

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