> On Jan 16, 2018, at 9:56 AM, Jon Gilbert via swift-evolution 
> <swift-evolution@swift.org> wrote:
> 
> No to this pitch, because a percentage can be higher than 100%.

โ˜๏ธ One need only look in Activity Monitor to see this in action.

> Use NumberFormatter to display a number as a percentage. 
> https://developer.apple.com/documentation/foundation/numberformatter 
> <https://developer.apple.com/documentation/foundation/numberformatter>
I agree 1000% ๐Ÿ˜‰ 

> Or you could make an NSNumber subclass if you want to enforce an arbitrary 
> rule upon numbers.

In theory you can; in practice you canโ€™t. Subclassing things like NSNumber is 
fraught with undocumented peril.

Dave
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