pub const MERSENNE31_POSEIDON2_PARTIAL_ROUNDS_24: usize = 22;Expand description
Number of partial rounds for Mersenne31 Poseidon2 (width 24).
Same Gröbner basis bound as width 16:
R_GB ≥ 17 + 0.4307 · min{5.12, 15.5} = 19.205
With the +7.5% security margin: ⌈1.075 × 19.205⌉ = 21.
The official round number script yields R_P = 22 for this configuration (matching the Grain LFSR parameters used to generate the round constants).