Comment #13 on issue 457 by [email protected]: Tail call elimination (feature request)
http://code.google.com/p/v8/issues/detail?id=457
Now http://wiki.ecmascript.org/doku.php?id=harmony:proper_tail_calls and very likely to be in ES.next.
Since Harmony is based on ES5 strict and ES5 strict poison-pills f.arguments for strict function f, and since tail position is a syntactic property, new code can count on proper tail calls. Old code can't necessarily, and mixing cannot, but that's not a reason to avoid proper tail calls in ES.next.
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