[swift-evolution] [Review] SE-0139: Bridge Numeric Types to NSNumber and Cocoa Structs to NSValue

Karl razielim at gmail.com
Sat Sep 10 21:52:01 CDT 2016

I know the review is over, but I just wanted to chime in with something: does this extend to types which are RawRepresentable as numeric types, too? 

For example, Cocoa and UIKit have several option-set types which must be placed in dictionaries. Just now I tried to use UIFontDescriptorSymbolicTraits and it crashed at runtime (radar://28244679 <radar://28244679>).

I consider the current behaviour extremely surprising and definitely a bug.


> On 2 Sep 2016, at 01:58, Douglas Gregor via swift-evolution <swift-evolution at swift.org> wrote:
> Hello Swift community,
> The review of SE-0139 "Bridge Numeric Types to NSNumber and Cocoa Structs to NSValue" begins now and runs through September 7, 2016. The proposal is available here:
> https://github.com/apple/swift-evolution/blob/master/proposals/0139-bridge-nsnumber-and-nsvalue.md <https://github.com/apple/swift-evolution/blob/master/proposals/0139-bridge-nsnumber-and-nsvalue.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 <https://lists.swift.org/mailman/listinfo/swift-evolution>
> or, if you would like to keep your feedback private, directly to the review manager. When replying, please try to keep the proposal link at the top of the message:
> Proposal link:
> https://github.com/apple/swift-evolution/blob/master/proposals/0139-bridge-nsnumber-and-nsvalue.md <https://github.com/apple/swift-evolution/blob/master/proposals/0139-bridge-nsnumber-and-nsvalue.md>
> Reply text
> Other replies
>  <https://github.com/apple/swift-evolution/blob/master/process.md#what-goes-into-a-review-1>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 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 <https://github.com/apple/swift-evolution/blob/master/process.md>
> Thank you,
> -Doug Gregor
> Review Manager
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