>> [...]
> 
> Hi, Nacho. This is discussed in the proposal as "'future' cases" under 
> "Alternatives considered". The main blocker was that such a case becomes 
> untestable (see also "Testing invalid cases"). That didn't seem like an 
> acceptable state of affairs to me or to the people I had originally discussed 
> the proposal with, but maybe the community feels differently?

As you state in the proposal, using `default` instead is exactly as untestable, 
in exactly the same way. Using that as an argument against future but not 
default is disingenuous. And default additionally introduces the enormous issue 
of killing compile-time safety, while future does not..

> 
> I would love if someone could think of something I haven't yet; by no means 
> do I think I'm the only one who can have ideas in this space.
> 
> Jordan
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