pub const fn cdf_4d<const VARS: usize, const CDF_LEN: usize, const N_2D: usize, const N_3D: usize, const N_4D: usize>( vars: [[[[u16; VARS]; N_2D]; N_3D]; N_4D], ) -> [[[[u16; CDF_LEN]; N_2D]; N_3D]; N_4D]