The way that WebIDL require Object.prototype.toString to return "[object TypePrototype]" for the interface prototype object and "[object Type]" for the instances seems to imply that every instance needs to have an own @@toStringTag.
http://people.mozilla.org/~jorendorff/es6-draft.html#sec-15.2.4.2 http://dev.w3.org/2006/webapi/WebIDL/#es-environment If an instance does not have its own @@toStringTag, Object.prototype.toString will read through to the [[Prototype]] which would return the wrong string. -- erik
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