Re: [webidl] Define DOMException.prototype.toString() (as this.name + ": " + this.message) (#93)

In Gecko, `DOMException.prototype.hasOwnProperty("toString")` is false.  However, Gecko implements this sentence from the spec you link to:

> The DOMException prototype object MUST have an internal [[Prototype]] property whose value is %ErrorPrototype% ([ECMA-262], section 6.1.7.4).

and if you look at http://www.ecma-international.org/ecma-262/6.0/#sec-error.prototype.tostring you will see that it does precisely the `this.name + ": " + this.message` with some complications if name or message undefined.

So this seems to be perfectly well defined already, and implemented as written by Gecko... what am I missing?

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https://github.com/heycam/webidl/issues/93#issuecomment-188859636