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It's a bit ugly. The biggest issue is that apparently V8 API completely decouples numeric and non-numeric property lookup, which forces us to have extra indexers. The indexers simply convert index value to string and pass it along to named property handling machinery. It's sad. I'll ask V8 folks what's up with that.
Otherwise, the story is very similar to bug 32996
Created an attachment (id=45624) [details]
Generate configuring of all indexers, v1.
(From update of attachment 45624 [details])
This patch feels like deja vu. I didn't quite follow all the machinations here, but the net result looks good. Hopefully our tests are strong enough to catch screw ups.
Landed as http://trac.webkit.org/changeset/52663.