The Chrome team's direct advice is to not optimize this way, and rather to write as idiomatically as possible, because it is likely that they are aware of the i

The Chrome team's direct advice is to not optimize this way, and rather to write as idiomatically as possible, because it is likely that they are aware of the issue (e.g. it's a new language feature and they are collecting usage data before doing optimizations), and it will improve with time.