Thanks to everyone for a good explanation, as I was assuming my expectations were wrong, guess partially, because of the SpiderMonkey's behavior in past (Thanks Brendan for clearing this up, I was pretty sure that was the behavior in xulrunner, apparently it's in past now :).
-- Irakli Gozalishvili Web: http://www.jeditoolkit.com/ Phone: +31 614 205275 Address: Taksteeg 3 - 4, 1012PB Amsterdam, Netherlands On Thu, May 20, 2010 at 20:54, Mike Samuel <[email protected]> wrote: > 2010/5/20 Oliver Hunt <[email protected]>: > >> So for a non host object o, > >> o.x = o.x - 1 > >> should yield a number regardless of the details of any setter for x on > >> o, assuming o is not frozen and said setter returns normally. > > > > The assignment operator is defined in the language fairly clearly in a > way that means that the behaviour is unaffected by the type of object being > assigned to -- eg. being a host object or not is (mercifully) not relevant > :D > > Quite right. Sorry for being confusing. > I ran into a corner case for IE6 and IE7 where postfix ++ does not > always yield a number, e.g. when applied to some host objects. The > comment at line 80 of > > http://code.google.com/p/google-caja/source/browse/trunk/tests/com/google/caja/browser-expectations.html > is my best recollection. > > > > > > > > --Oliver > > > > >
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