https://github.com/petkaantonov/bluebird/wiki/Optimization-killers#3-managing-arguments

clone_args.js

// Returns a non-leaking, optimizable, safe close of `arguments`

// usage: var args = clone_args.apply(this, arguments)

module.exports = function clone_args() {
  var i = arguments.length
  var clone = new Array(i)
  while (i--) clone[i] = arguments[i]
  return clone
}