def sized
import bend-collections@1.0.0.0/src/crypto/blake/blake3/blake3.bend as Blake3import Base
207def sized(+length: Nat, pair: Array<U32> & U32) -> Maybe<&1,Array<U32>>:
208 (a,capacity) = pair
209 checked(Nat.is_le(length,Nat.mul(4n,U32.to_nat(capacity))),a,length)