@ApiStatus.ScheduledForRemoval
  @Deprecated
  @SuppressWarnings("LambdaUnfriendlyMethodOverload")
  public void appendData(Key key, @NotNull ValueDataAppender appender) throws IOException {
    myImpl.appendData(key, appender);
  }
@ApiStatus.ScheduledForRemoval
  @Deprecated
  @SuppressWarnings("LambdaUnfriendlyMethodOverload")
  public void appendData(Key key, @NotNull ValueDataAppender appender)