From: Allen Wirfs-Brock [mailto:al...@wirfs-brock.com]
> What do you mean by "is an instance of some %ArrayPrototype%"? Do you mean > that it has some %ArratPrototype% in it's prototype chain? Yeah, more or less. A "realm-independent instanceof." This makes sense also from the historical perspective that `Array.isArray` was meant to provide a cross-realm alternative to `instanceof Array`. (I believe that was the case; before my time.) However as you pointed out in a related conversation this would not be backward-compatible, i.e. it would change the answer for code that does prototype munging. > This is actually fairly hard to determine. We look at trying to identify > known prototypes independent of realm for an earlier issue and rejected the > possibility because it would require additional tragging of such prototypes. > Also, it wasn't clear who the concept could be extended to JS defined classes. Right, good points. Probably not the way to go, indeed. _______________________________________________ es-discuss mailing list es-discuss@mozilla.org https://mail.mozilla.org/listinfo/es-discuss
