Subj : Re: Object properties that dont yet exist?
To   : Brian <genisiob@pilot.msu.edu>
From : Brendan Eich <brendan@meer.net>
Date : Tue Oct 07 2003 11:48 am

Brian wrote:

>SOrry to reply to my own message, but I understand more now than when
>I wrote this.  Now, I see that I can generate an AddProperty callback
>when this is done, which gives me a big id number (1559158).
>

The id is a jsval, so that's not an int-tagged jsval (JSVAL_IS_INT(id) 
evaluates to false).  In fact it is a tagged JSString pointer. You 
shouldn't treat it as an int-tagged jsval, although it's ok to treat the 
entire jsval as a word-sized number.

>  If I set
>the value, I also get the SetProperty callback with the same big id
>number.
>  
>

Why don't you just let non-predefined property ids alone in your 
setProperty hook?  Why throw an error for them?

/be

.