Standard builtins' prototypes and toString

André Bargull andre.bargull at
Thu Jun 12 10:32:01 PDT 2014

> On Thu, Jun 12, 2014 at 12:48 PM, Jason Orendorff
> <jorendorff at  <>> wrote:
> >/  In any case, I doubt we have a choice. ES3-5 at least supported it. There is
> />/  surely a Web page somewhere that calls .toString() on every object it can
> />/  find, just because.
> /

Or a web page converts some value to a string using `"" + someValue`, in 
which case adding a toString() legacy mode is not sufficient, because 
valueOf() is actually invoked (well, except for Date.prototype because 
of its @@toPrimitive override). Does that mean valueOf() also needs to 
have a legacy mode to special case the prototype object?
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