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

[Jordan Rose]

Remember, the goal here is to support both binary and source compatibility. An existing app might be using the enum case that you're trying to remove, but there's no chance that an existing app is using an enum case that you're trying to add.

Jordan


> On Jan 10, 2018, at 16:34, Howard Lovatt via swift-evolution <swift-evolution at swift.org> wrote:
> 
> 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).
>> 
>> 
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