Haha, yeah JS integers "can grow". Kind of. And then they bite you in the worst way possible. Especially when combined with cryptography (e.g. nonces).

Try this:

  >> const x = 288230376151711740;
  >> x == x + 1
  true

Or this:

  >> 2\*1024
  Infinity

JS doesn't even have integers. It only has floats. JS is by far the worst language I know of when it comes to integer support.

If you want a better example of arbitrary precision integers, try Python, for example.