`fn.bind` is ~25x slower than arrow functions. who knew? not me at least

bind-vs-arrow-fn

$ ITER=1000000 node out.js
Ran with .bind in  1691
Ran with arrow function in  75

$ ITER=10000000 node out.js
Ran with .bind in  16719
Ran with arrow function in  734

out.js

'use strict';

const ITER = parseInt(process.env.ITER || 10000);

const a = function(val){ return val + 1; };

const aStart = Date.now();

for (let i = 0; i < ITER; i++) {
  const fn = a.bind(null, 1);
  fn();
}

console.log('Ran with .bind in ', (Date.now() - aStart));

const bStart = Date.now();

for (let i = 0; i < ITER; i++) {
  const fn = () => { return a(1); };
  fn();
}

console.log('Ran with arrow function in ', (Date.now() - bStart));