`let` doesn't deoptimize anymore - actually V8 has made great strides here, and a lot of new syntax will go through the optimizer. More generally though, I woul

`let` doesn't deoptimize anymore - actually V8 has made great strides here, and a lot of new syntax will go through the optimizer. More generally though, I wouldn't think the stuff I'm worrying about would show up in microbenchmarks.