Specifically, I'm curious if tuples could take the place of structs, and equivalents for registry.assign<position> and registry.view<position, velocity>.
I can imagine registry as a seq[int], with each entity being represented by a unique integer, but I don't know how to assign tuples to an int. I really like the ability to filter entities to only those with the specific components of interest. Is there a way to achieve the same in Nim? [EnTT examples](https://github.com/skypjack/entt/blob/master/README.md#code-example)
