Comment #8 on issue 3337 by [email protected]: Not caching map transitions when using SetIndexedPropertiesToExternalArrayData()
http://code.google.com/p/v8/issues/detail?id=3337

I'm largely leaning on help from Egorov. Mostly I just tracked down the commit. Here's our correspondence: https://twitter.com/trevnorris/status/468598934584053760

I reverted that commit on 3.25.30 and re-ran the test, setting b.length. Here's the result:

$ /usr/bin/time /var/projects/node-trev/node run.js
1.44user 0.00system 0:01.45elapsed 100%CPU (0avgtext+0avgdata 15176maxresident)k
0inputs+0outputs (0major+4029minor)pagefaults 0swaps

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