> On Jun 29, 2016, at 12:15 PM, Michael Peternell <michael.petern...@gmx.at> 
> wrote:
> 
> 
>> Am 29.06.2016 um 15:54 schrieb David Sweeris via swift-evolution 
>> <swift-evolution@swift.org>:
>> 
>> +1 for the concept of a "sealed” class.
>> -1 for making it default.
> 
> Aren't sealed classes already implemented? I think the keyword is `final`..
> So there is nothing left to do :)

No, `final` doesn’t allow for any subclassing, but `sealed` allows for 
subclassing within your module (where you can presumably write more efficient 
code based on knowledge of each subclass).

- Dave Sweeris
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