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

bugzilla-daemon at webkit.org bugzilla-daemon at webkit.org
Wed Sep 7 12:14:30 PDT 2011


Gavin Barraclough <barraclough at apple.com> changed:

           What    |Removed                     |Added
                 CC|                            |barraclough at apple.com

--- Comment #20 from Gavin Barraclough <barraclough at apple.com>  2011-09-07 12:14:30 PST ---
> I still do not figure out why ToString(18446744073709551615) is evaluated as 18446744073709552000

See section 9.8.1 of the spec, NOTE 2.  The upshot of this clause is that JS implementations are required to generate the least number of non-zero digits that uniquely identify a value.

The string "18446744073709551615" converted to a double will internally have the value 18446744073709551616, however the number 18446744073709551616 converted to a string will convert to the string "18446744073709552000", if this is converted to a number it will round trip back to 18446744073709551616.

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