From: Allen Wirfs-Brock [mailto:allen at wirfs-brock.com]
Sent: Tuesday, July 16, 2013 7:02 PM
To: Luke Hoban
Cc: es-discuss
Subject: Re: 12["__proto__"]


On Jul 16, 2013, at 6:33 PM, Luke Hoban wrote:


All current engines I could try return Number.prototype for:

12["__proto__"]

But the new spec says this should be a TypeError.

It's more consistent with the other members of Object.prototype to do an implicit ToObject here, and apparently matches existing implementations.  Is it intentional that the spec is treating this as a TypeError?


Well, it was intentional, but perhaps wrong. As you say, the  set accessor probably needs to do a ToObject.  The set accessor probably only needs to do a CheckObjectCoercible  followed by an immediate return if the type of this is not Object (the wrapper and hence it's modified [[Prototype]] isn't observable, so it doesn't actually need to be created).

File a bug, and I'll put the revised algorithms into the ticket.

Opened https://bugs.ecmascript.org/show_bug.cgi?id=1586.

Luke



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Opened https://bugs.ecmascript.org/show_bug.cgi?id=1586.