@CheckReturnValue
    @NonNull
    public final <R> ParallelFlowable<R> map(@NonNull Function<? super T, ? extends R> mapper, @NonNull ParallelFailureHandling errorHandler) {
        ObjectHelper.requireNonNull(mapper, "mapper");
        ObjectHelper.requireNonNull(errorHandler, "errorHandler is null");
        return RxJavaPlugins.onAssembly(new ParallelMapTry<T, R>(this, mapper, errorHandler));
    }