Support an arbitrarily large number of universes

[charliebruce]

I think currently if you have a setup with a large number of universes, the library will throw an error. The library's limit is possibly 16 based on this, the spec allows up to a theoretical maximum of 32,768 universes (though the practical limit is lower).

It's somewhat an edge case, but would be great if this limit could either be configurable, or could be adjusted to accept an arbitrary number of universes. I'm happy to put in a pull request if you have a preferred approach.