Sorry, I said NSProgress but I meant NSPredicate. I personally can't even 
imagine what a alternative API for NSPredicate would look like 🤔

> On 15 Mar 2016, at 00:21, Tony Parker <anthony.par...@apple.com> wrote:
> 
> Hi David,
> 
> It’s likely that we’ll have to come up with some alternative API in these 
> cases. For example, in NSProgress I could imagine a callback for progress 
> updates instead of observing the properties. It’s not ideal but I don’t think 
> we want to undertake a reinvention of KVO when we do not have the Objective-C 
> runtime present (so much of it relies on that dynamic behavior).
> 
> - Tony
> 
>> On Mar 14, 2016, at 4:14 PM, David Hart via swift-corelibs-dev 
>> <swift-corelibs-dev@swift.org> wrote:
>> 
>> I was looking through Foundation for stuff to do and saw NSProgress, 
>> NSExpression and NSSortDescriptor. They seem to be most reliant on KVC, and 
>> as KVC is not available without the Objective-C runtime, I’m not sure what 
>> those classes are doing here. Are those classes doomed to be dropped? Or is 
>> there another way to implement them?
>> 
>> David.
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>> swift-corelibs-dev@swift.org
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> 
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