function exactEquals(a, b) {
  return a[0] === b[0] && a[1] === b[1] && a[2] === b[2] && a[3] === b[3];
}
Returns whether or not the vectors have exactly the same elements in the same position (when compared with ===)

@param {vec4} a The first vector.
@param {vec4} b The second vector.
@returns {Boolean} True if the vectors are equal, false otherwise.