[fenomas]

The JS language as specified is interpreted and doesn't have ints or first-class arrays; the code run by the VM that runs Node.js code is compiled and runs on smallints and arrays and so on.

(Not sure if you already knew this, but if so, you're not being factual, you're being selectively pedantic to make something sound worse than it is. Lack of ints or arrays isn't a big factor in JS performance for non-pathological cases.)

(edit: reasons for downvotes are appreciated!)