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<pre>On Jun 12, 2014, at 5:26 AM, Till Schneidereit wrote:
><i> While working on changing Date.prototype to be a plain object in SpiderMonkey, we realized that there's an issue: the way things are specced now, `alert(Date.prototype)` will throw, because `Date.prototype.toString` isn't generic. The same applies for all builtins with non-generic `toString` prototype functions.
Fortunately there aren't very many of those. I think it is only Date and RegExp that have this issue among the ES6 built-ins</pre>
And Number.prototype, String.prototype, Boolean.prototype and
Symbol.prototype. And actually it's even worse for Symbol.prototype
because of the @@toPrimitive override.<br>