bigint cannot be replaced by regular number when working with arbitrarily large whole numbers. With regular numbers you will lose precision out of the range [Nu

bigint cannot be replaced by regular number when working with arbitrarily large whole numbers. With regular numbers you will lose precision out of the range [Number.MIN_SAFE_INTEGER, Number.MAX_SAFE_INTEGER]. If you try to implement such functionality via JS, it would be even much slower than the bigint native implementation. So, it's great to have such thing natively implemented.