he/him 
Native ES6 ~4.5x faster than transpiled code on V8 #blinkonpic.twitter.com/L5VbjZueCY
What's the code example on the left...? That's definitely not Babel output.
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I’d guess that’s the “+ hacks” part
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Seems close enough http://babeljs.io/repl/#?babili=false&browsers=&build=&builtIns=false&code_lz=GYVwdgxgLglg9mABMOcBsAKYAaRA6AgQwCcBzAZwEpEBvAKEUWIFMoRilgMC8SLKA3HQC-QA&debug=false&circleciRepo=&evaluate=true&lineWrap=false&presets=es2015%2Creact%2Cstage-2&prettier=false&targets=&version=7.0.0-beta.0 … (without the fast paths for args len < 4)? @ripsawridge should know more
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