Comment #6 on issue 1434 by [email protected]: Crankshafted === specialized for doubles doesn't handle undefined correctly
http://code.google.com/p/v8/issues/detail?id=1434
A better solution will be to make a flag on the HChange instruction only, so that when an HChange is inserted, it can see if its use is HCompare, and if it is tagged-to-double, and set the flag in that case.
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