static <U, V> @NonNull Either<U, V> ofFallback(final @NonNull V value) {
        return EitherImpl.of(null, requireNonNull(value, "value"));
    }
Creates an instance with a {@code value} of the fallback type {@link V}.

@param <U>   primary value type
@param <V>   secondary value type
@param value primary value
@return the instance
cloud-core/src/main/java/org/incendo/cloud/type/Either.java