I'm not seeing it in the latest Harmony draft, but it is already available in some implementations, and polyfills tend to have it.
(one of) The issue(s) which is coming up for us WRT O.o is that current implementations don't seem to work well with computed properties (IE es5 getter/setter functions), which is possibly a point of contention in the draft. Better to ask someone who is seriously paying attention to that stuff, though.
(one of) The issue(s) which is coming up for us WRT O.o is that current implementations don't seem to work well with computed properties (IE es5 getter/setter functions), which is possibly a point of contention in the draft. Better to ask someone who is seriously paying attention to that stuff, though.