There's also the assumption that null is address 0. Notably breaking the purity of C++s type system with magic 0s for 20 odd years before nullptr came along.
That is the point. They went through the process of tightening down the type system by invalidating automatic casts and making void* less promiscuous and then they break that whole philosophy with a magic literal "0" that can work as a normal integer or as an address placeholder for any pointer even though it won't necessarily evaluate to address zero. At that point why can't I assign "0" to a float too and enjoy some more magic there?
