I think that it’s very useful (I use it frequently in unit tests). I hope that 
this stays the way it is now.

> On Mar 30, 2016, at 12:59 PM, Joe Groff via swift-evolution 
> <swift-evolution@swift.org> wrote:
> 
> Many people are surprised when they find out defaulted parameters can be 
> reordered, unlike required arguments. This special case adds complexity to 
> the language, and runs against our general trend of treating argument labels 
> as a significant part of an API's name, and preferring a single way of 
> writing API calls. I think it's worth revisiting this design choice—is the 
> special case worth the complexity? How many people take advantage of default 
> argument reordering?
> 
> -Joe
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