polynomial, an element of R_q. type ringElement [n]fieldElement // polyAdd adds two ringElements or nttElements. func polyAdd[T ~[n]fieldElement](a, b T) (s T) { for i := range s { s[i] = fieldAdd(a[i], b[i]) } return s } // polySub subtracts two ringElements or nttElements. func polySub[T ~[n]fieldElement](a, b T) (s T) { for i := range s { s[i] = fieldSub(a[i], b[i]) } return s } // nttElement is an NTT representation, an element of T_q. type nttElement [n]fieldElement // zetas are the values ζ^BitRev₈(k)...