Re: Reconciling handling of optional arguments and handling of default values across ES and webidl

On 5/8/2013 11:18 AM, Boris Zbarsky wrote:
> 2)  Have arguments.length not include trailing undefined values.

Do you mean only when there's defaults defined? As in this returns `0`:

     (function(a = 1, b = 2, c = 3){
       return arguments.length;
     })(undefined, undefined, undefined);


For compatibility with a lot of existing JS code, the following must 
return `3`:

     (function(a, b, c){
       return arguments.length;
     })(undefined, undefined, undefined);