[swift-evolution] [Review] SE-0069: Mutability and Foundation Value Types

Rod Brown rodney.brown6 at icloud.com
Tue Apr 26 07:56:52 CDT 2016

> 	* What is your evaluation of the proposal?
+1 I concur with David Hart: Foundation becoming the base first-class cross platform library seemed concerning when Foundation was build from a paradigm of “Object Everything”. This fits far better with the Swift philosophy of value types where appropriate.

> 	* Is the problem being addressed significant enough to warrant a change to Swift?
Absolutely. As the basis for Swift Frameworks to come, I think it’s essential we do this right. This represents a clear streamlining of “legacy” Foundation with modern Swift.

> 	* Does this proposal fit well with the feel and direction of Swift?
Yes. This brings Foundation behaviour into line with Swift value-type behaviour.

> 	* If you have you used other languages or libraries with a similar feature, how do you feel that this proposal compares to those?
Not personally. Most of my experience informing this decision relates to Objective-C code, and using Objective-C Foundation in Swift.

> 	* How much effort did you put into your review? A glance, a quick reading, or an in-depth study?
A full read, and following the initial discussion of value types in Swift for the past several months.

> More information about the Swift evolution process is available at
> 	https://github.com/apple/swift-evolution/blob/master/process.md
> Thank you,
> -Chris Lattner
> Review Manager
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