Comment #3 on issue 3913 by [email protected]: Poor performance for
for-in with lots of keys
https://code.google.com/p/v8/issues/detail?id=3913
Yes, Crankshaft has only partial support for for-in; this particular
example is not supported, so we run in unoptimized code, which is
expectedly slow.
For Crankshaft this will never get fixed. I don't know what exactly the
plans for TurboFan are. I'd imagine it's possible that we'll just
concentrate on for-of instead.
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