public static <T> ZstdCoder<T> of(Coder<T> innerCoder, byte[] dict, int level) {
    return new ZstdCoder<>(innerCoder, dict, level);
  }
@Test
  public void testCoderIsSerializableWithWellKnownCoderType() throws Exception {
    CoderProperties.coderSerializable(ZstdCoder.of(GlobalWindow.Coder.INSTANCE));
  }