Subj : Re: -x when x == 0 treated as a double ?
To   : Mike Shaver
From : Brendan Eich
Date : Wed Jan 26 2005 08:35 pm

Mike Shaver wrote:
> bubbfree@gmail.com wrote:
> 
>> I have some unexpected behavior in SpiderMonkey (latest RC6).  If I do
>> this:
>>
>> var x = 0;
>> myNativeFunction(-x);
>>
>> the jsval in argv[0] for my native handler is of type double. I would
>> have expected int.
> 
> 
> I think double is correct there.  Spidermonkey will express a number 
> internally as an int jsval only if the transformation is exact.  Since 
> there's no integer representation with jsvals for -0, IIRC, it will 
> always be a double.


Quite right, but the myNativeFunction(-0) case should also get a double 
jsval, not an int jsval.

/be

.