I'm guessing you haven't seen the new data types?

- https://developer.mozilla.org/en-US/docs/Web/JavaScript/Refe... - https://developer.mozilla.org/en-US/docs/Web/JavaScript/Refe... - https://developer.mozilla.org/en-US/docs/Web/JavaScript/Refe... - https://developer.mozilla.org/en-US/docs/Web/JavaScript/Refe... - https://developer.mozilla.org/en-US/docs/Web/JavaScript/Refe... - https://developer.mozilla.org/en-US/docs/Web/JavaScript/Refe... - https://developer.mozilla.org/en-US/docs/Web/JavaScript/Refe... - https://developer.mozilla.org/en-US/docs/Web/JavaScript/Refe... - https://developer.mozilla.org/en-US/docs/Web/JavaScript/Refe... - https://developer.mozilla.org/en-US/docs/Web/JavaScript/Refe...

Nowadays Javascript supports packed binary data natively. The only things that Javascript lacks is a 64-bit integer type. All other numeric types can safely be represented in a double.

JITs can also use integer types internally when possible (small integer optimization).