Compiler: Flow Enums with Unknown Members instead of `"%future added value"`

I've been reading through the new [Flow Enums](https://flow.org/en/docs/enums/) documentation and one thing that caught my attention was [enums with unknown members](https://flow.org/en/docs/enums/defining-enums/#toc-flow-enums-with-unknown-members). In short:

```js
enum Status {
Active,
Paused,
Off,
...
}
```

Specifically the last sentence:

> One use case for this would be the JS output of [GraphQL Enums](https://graphql.org/learn/schema/#enumeration-types): Flow Enums with unknown members could be used instead of the added `'%future added value'` member.

So my question/feature request is: are you considering this? Would you consider it?

Thanks! 😎