This is one of the reasons that Julia doesn't do automatic big num conversion, instead using native machine two's complement modular arithmetic for integers. It

This is one of the reasons that Julia doesn't do automatic big num conversion, instead using native machine two's complement modular arithmetic for integers. It would be a good optimization to use an immediate representation for small bignums, however. See this FAQ entry https://docs.julialang.org/en/v1/manual/faq/#faq-integer-arithmetic https://docs.julialang.org/en/v1/manual/faq/#faq-integer-ari... on the subject.