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Re:Mozilla’s new (internal) JavaScript value representation by pcwalton on Tuesday August 03, 2010 @12:13PM (#1571671)
JavaScript will never support threads in the usual sense, as long as /be has his say: http://weblogs.mozillazine.org/roadmap/archives/2007/02/thre...

So JS won't need fine-grained locking in the foreseeable future.

Re:Mozilla’s new (internal) JavaScript value representation by jimbokun on Tuesday August 03, 2010 @02:55PM (#1572248)
"A requirement for JS3 (along with hygienic macros)"

Did anything ever come of hygienic macros for JavaScript? (first time I heard that)