Entity as a type is an generational ID. We only support up to 2^32 entities in a World, which makes up the bottom 32 bits. The top 32 bits is the generation. On

Entity as a type is an generational ID. We only support up to 2^32 entities in a World, which makes up the bottom 32 bits. The top 32 bits is the generation. Once we destroy an entity, it's ID is reused, but the generation is increased.