def clamp_from
import bend-collections@1.0.0.0/spec/crypto/poly1305.bend as Poly1305import Base
89def clamp_from(r: List<&2, U32>, +i: Nat) -> List<&2, U32>:
90 match r:
91 case Nil{}: Nil{}
92 case b <> rest: U32.and(b, clamp_mask(i)) <> clamp_from(rest, 1n+i)