fn byte_encode<F: Field, D: EncodingSize>(
vals: &Array<Elem<F>, U256>,
) -> Array<u8, <D as EncodingSize>::EncodedPolynomialSize>fn byte_encode<F: Field, D: EncodingSize>(
vals: &Array<Elem<F>, U256>,
) -> Array<u8, <D as EncodingSize>::EncodedPolynomialSize>