To auto-promote to BigInt in case of an overflow, use a quote after the star(multiplier) operator. Since HN is not allowing me to use star in this comment here

To auto-promote to BigInt in case of an overflow, use a quote after the star(multiplier) operator. Since HN is not allowing me to use star in this comment here is the link to the gist with a simple factorial example: https://gist.github.com/devasiajoseph/8485836 https://gist.github.com/devasiajoseph/8485836