[webkit-reviews] review requested: [Bug 11130] Convert "undefined" to AE missing value : [Attachment 10881] proposed patch

[bugzilla-request-daemon at macosforge.org]

Alexey Proskuryakov <ap at nypop.com> has asked  for review:
Bug 11130: Convert "undefined" to AE missing value
http://bugs.webkit.org/show_bug.cgi?id=11130

Attachment 10881: proposed patch
http://bugs.webkit.org/attachment.cgi?id=10881&action=edit

------- Additional Comments from Alexey Proskuryakov <ap at nypop.com>
There's also cUndefined, but that one is never mentioned in documentation I
could find, and is actually for internal use:
<http://listserv.dartmouth.edu/scripts/wa.exe?A2=ind9911&L=macscrpt&T=0&P=9383>
.

The null descriptor is technically in the same category as undefined - we are
not supposed to return it AFAICT. However, many applications return it now
(apparently, Cocoa Scripting is to blame), and we probably need some way to
differentiate JS null from JS undefined anyway. The other cases
(UnspecifiedType, GetterSetterType) should probably be made to just return AE
errors eventually.