[swift-evolution] Handling unknown cases in enums [RE: SE-0192]

[Howard Lovatt]

If an enum isn’t final; then what’s the difference in deleting as opposed to adding?

-- Howard. 

> On 10 Jan 2018, at 4:13 pm, Jean-Daniel <mailing at xenonium.com> wrote:
> 
> 
> 
>> Le 10 janv. 2018 à 23:58, Howard Lovatt via swift-evolution <swift-evolution at swift.org> a écrit :
>> 
>> Two points:
>> 
>> 1. I like Chris’s suggestion of #unknown and in particular that it is distinct from default. 
>> 
>> 2. All the discussion is about a framework adding a case, what about when a framework deletes a case?
> 
> This is a binary breaking change (just like removing an existing function or method).
> 
>