[swift-evolution] [Pitch] Enforce argument order for defaulted parameters

Joe Groff jgroff at apple.com
Wed Mar 30 11:59:50 CDT 2016

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?


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