- inspect mulmul without intermediate product: to be better only stack must employed (no Vec writes) => addition method split
- make pow log effecient
- ponder about zero meaning, usage
- consider shortcuts: power of 0, 1 are known for all powers, 0 * anything = 0, etc.
- array of usizes (https://byjus.com/maths/binary-addition/, https://byjus.com/maths/binary-multiplication/), 2-10 conversion only problem?