const WORD: { 33 fields }
The unsigned words: counts, the lattice seed, one 32-bit lane per band seed, the octave count per band, and one flag.
Seeds travel as words because they are uint32 and a float holds 24 bits;
noise3 reads seed.a alone, and only the chaos lattice reads a second
lane, which is why SEED_CHAOS_B is the one exception.