Variants

[TTWNO]

(On mobile, excuse spelling)

Do you feel that variants would be in-scope for this library?

To do this effectively, I think a generic Rule trait may be required that allows you to (de)active any arbitrary sets of rules so thst variants can be easily built and added on to without much fuss.

I understand if you beleive your library is not rhe right place for such a feature, but I'd be willing to write up a PR if you think it could work.

Let me know what you think about the idea in general and specifically about using a new Rule trait.

Thanks so much for your great work! I love it when there's no external dependencies!