Its author, François REMY, is now on the layout team working on Edge. I wouldn't at all be surprised if he was one of the people on the Edge team working on upd

Its author, François REMY, is now on the layout team working on Edge. I wouldn't at all be surprised if he was one of the people on the Edge team working on updating their implementation. There are definitely cases for which the polyfill is likely going to be asymptotically worse than a native implementation, though there will also be plenty of simple cases where the efficiency loss is relatively small.