URC enum cannot be bigger than 21 variants

[Kezii]

how can it be increased?

error[E0277]: the trait bound `(..., ..., ..., ..., ..., ..., ..., ..., ..., ..., ..., ..., ..., ..., ..., ..., ..., ..., ..., ..., ..., ...): Alt<_, _, _>` is not satisfied
   --> src/commands/global_urc.rs:247:17
    |
247 | #[derive(Clone, AtatUrc, defmt::Format, PartialEq)]
    |                 ^^^^^^^ unsatisfied trait bound
    |
    = help: the trait `atat::nom::branch::Alt<_, _, _>` is not implemented for `(..., ..., ..., ..., ..., ..., ..., ..., ..., ..., ..., ..., ..., ..., ..., ..., ..., ..., ..., ..., ..., ...)`
    = help: the following other types implement trait `atat::nom::branch::Alt<I, O, E>`:
              (A, B)
              (A, B, C)
              (A, B, C, D)
              (A, B, C, D, E)
              (A, B, C, D, E, F)
              (A, B, C, D, E, F, G)
              (A, B, C, D, E, F, G, H)
              (A, B, C, D, E, F, G, H, I)
            and 13 others
note: required by a bound in `alt`
   --> /home/kezi/.cargo/registry/src/index.crates.io-1949cf8c6b5b557f/nom-7.1.3/src/branch/mod.rs:47:49
    |
 47 | pub fn alt<I: Clone, O, E: ParseError<I>, List: Alt<I, O, E>>(
    |                                                 ^^^^^^^^^^^^ required by this bound in `alt`

[MathiasKoch]

This is not really an issue with ATAT, but is due to rust-bakery/nom#1854

Please make your case on the nom issue tracker.