I think the JS spec would have been better served with a different syntax for generator/iterator destructuring. Most code I've seen assumes that:

  [a, b, ...rest] = array

is implemented like this:

  a = array[0]
  b = array[1]
  rest = array[2...]

When instead it is a giant performance footgun to the point where it should only be used outside of performance critical code.

EDIT "next -> rest"