I read it once without knowing what double dispatch is, after reading it , I did not know what double dispatch is. It took several reads to understand what double dispatch is.��

My suggestion is starting with explaining as a summary what double dispatch is , instead of leaving it for the conclusion, explain not how it works but why we need it. Its a good idea to give a general picture to the reader before a practical example as a map to follow the example more easily and not be lost in the code. The code is easy to understand but the intention is not.��

Also what is a "die handle" ?��