Toon, this is your turf.

Weiliang, I think the code is working this way intentionally. Keeping an IC
monomorphic is generally desirable; going polymorphic unnecessarily can hurt
performance quite a bit.
Do you have any particular case where the changed version works better? Have you
made sure that it doesn't cause regressions elsewhere?

https://codereview.chromium.org/13910012/

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