@Override
  public byte[] engineSeal(byte[] plaintext, byte[] aad) {
      return (byte[]) invokeNoChecked("engineSeal", plaintext, aad);
  }
Duck typed implementation of {@link HpkeSpi}.
<p>
Will wrap any Object which implements all of the methods in HpkeSpi and delegate to them
by reflection.
common/src/main/java/org/conscrypt/DuckTypedHpkeSpi.java