I haven't tried to directly replace them yet but I would imagine that in order 
to replicate behavior some of the reference types will still be needed. That 
being said, other classes may no longer have any real value (not fully intended 
to be a pun) since types like NSDate are just simple wrappers around a simple 
value type. There will be a few parts: like coding or property lists that will 
still need to internally require a reference type to manipulate in CF code.

The boxing types will be simpler than the overlay for Objective-C since the 
corelibs version are all Swift classes at their base.

In short I think it would be best to just add and not remove things for now 
from swift-corelibs-foundation when modifications are made to bring these in 
sync. 

Sent from my iPhone

> On Apr 25, 2016, at 8:35 PM, David Waite via swift-evolution 
> <swift-evolution@swift.org> wrote:
> 
> Comments:
> 
> - The sentences "These new struct types will be implemented in the Swift 
> overlay. Immutable/mutable pairs (e.g. Data and MutableData) will become one 
> mutable struct type” are a duplicate and may be a copy/paste error.
> 
> - I am unsure when a new struct type contains a mutable or immutable boxed 
> object. 
> 
> - Is there a goal to eventually replace/remove the NS* versions completely 
> within corelibs-foundation?
> 
> -DW
> 
>> On Apr 25, 2016, at 4:21 PM, Matthew Johnson via swift-evolution 
>> <swift-evolution@swift.org> wrote:
>> 
>> Enormous +1.  This is a no-brainier IMO.  I am really happy to see this 
>> being tackled in the Swift 3 timeframe.
>> 
>> Sent from my iPad
>> 
>>> On Apr 25, 2016, at 12:27 PM, Chris Lattner <clatt...@apple.com> wrote:
>>> 
>>> Hello Swift community,
>>> 
>>> The review of "SE-0069: Mutability and Foundation Value Types" begins now 
>>> and runs through May 4. The proposal is available here:
>>> 
>>>   
>>> https://github.com/apple/swift-evolution/blob/master/proposals/0069-swift-mutability-for-foundation.md
>>> 
>>> Reviews are an important part of the Swift evolution process. All reviews 
>>> should be sent to the swift-evolution mailing list at
>>> 
>>>   https://lists.swift.org/mailman/listinfo/swift-evolution
>>> 
>>> or, if you would like to keep your feedback private, directly to the review 
>>> manager.
>>> 
>>> What goes into a review?
>>> 
>>> The goal of the review process is to improve the proposal under review 
>>> through constructive criticism and, eventually, determine the direction of 
>>> Swift. When writing your review, here are some questions you might want to 
>>> answer in your review:
>>> 
>>>   * What is your evaluation of the proposal?
>>>   * Is the problem being addressed significant enough to warrant a change 
>>> to Swift?
>>>   * Does this proposal fit well with the feel and direction of Swift?
>>>   * If you have you used other languages or libraries with a similar 
>>> feature, how do you feel that this proposal compares to those?
>>>   * How much effort did you put into your review? A glance, a quick 
>>> reading, or an in-depth study?
>>> 
>>> 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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>> 
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