What if you go beyond Number.MAX_SAFE_INTEGER?

es6-integer-overflow.es

console.log('MAX_SAFE_INTEGER is ' + Number.MAX_SAFE_INTEGER);

let i = Number.MAX_SAFE_INTEGER - 100;
while (i + 1 > i) { i = i + 1; }

console.log('True max integer is ' + i);
console.log('Overflowed integer is ' + (i + 1));