I am handing off the final decision of whether we want to land this change or not off to Andreas, since he is leading the ES6 effort. To me the cost-benefit ratio of this change is unclear due to lack of a concrete (non-micro) benchmark.

I personally am not a huge fan of the amount of micro-optimization that is going on (i.e. manual loop unrolling) and would rather keep it simple, but I can see the benefits of having a O(log n) implementation instead of O(n). <sarcasm>Of
course there is a O(1) solution by just introducing a RepString instance
type.</sarcasm>

Andreas: WDYT?

https://codereview.chromium.org/401783003/

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