[swift-evolution] [Idea] NonEmptyArray

[Charlie Monroe]

I've come across multiple cases, where you simply know the array is never empty and hence the optionality on first, last and behavior of a few other members is slightly different. Also, there are cases where you want to declare that you shouldn't pass an empty array e.g. into an initializer.

I was wondering whether Swift could have a specialized NonEmptyArray that could be used throughout the stdlib - e.g. String.components(separatedBy:) would return NonEmptyArray.

Thoughts?
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