Updates:
Status: Fixed
Comment #3 on issue 1617 by [email protected]: --harmony-weakmaps
breaks Object.defineProperty for value properties
http://code.google.com/p/v8/issues/detail?id=1617
Fixed in r8941. The WeakMap constructor didn't have a unique prototype, so it shared one with Object. All WeakMap functions (including "get" and "set") were installed on that prototype.
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