Great, sounds good. If you ever notice a divergence, feel free to either file a 
bug or submit a PR that adds the comment. I don’t want to lose track of these 
things.

- Tony

> On Jan 4, 2016, at 11:55 AM, Ian Ynda-Hummel <iany...@gmail.com> wrote:
> 
> Got it. I've seen the experimental thing elsewhere in the code. I'll work 
> under the assumption that inconsistencies are experimental and I'll open bugs 
> for things that are inconsistent but not marked as such.
> 
> On Mon, Jan 4, 2016 at 2:51 PM Tony Parker <anthony.par...@apple.com 
> <mailto:anthony.par...@apple.com>> wrote:
> Hi Ian,
> 
> Any place where the API differs should be marked with a comment like this:
> 
> /// - Experiment: This is a draft API currently under consideration for 
> official import into Foundation
> 
> If not, then we found some place that we either need to change or propose a 
> change for. We can track those with bugs on bugs.swift.org 
> <http://bugs.swift.org/>. Most of the ‘Experiment’ APIs are something we have 
> no alternative but to change, though.
> 
> Thanks for your work on this,
> - Tony
> 
> 
>> On Dec 21, 2015, at 5:39 PM, Ian Ynda-Hummel via swift-corelibs-dev 
>> <swift-corelibs-dev@swift.org <mailto:swift-corelibs-dev@swift.org>> wrote:
>> 
> 
>> I've been working on SR-276 <https://bugs.swift.org/browse/SR-276> and I'm 
>> finding a fair amount of inconsistencies between corelib Foundation and OS X 
>> Foundation. It seems to be most common with optionality of return values. 
>> e.g., in NSURL
>> 
>> corelib:
>>     public func URLByAppendingPathComponent(pathComponent: String) -> NSURL?
>> 
>> OS X:
>>     public func URLByAppendingPathComponent(pathComponent: String) -> NSURL
>> 
>> That particular case seems to be a difference in the treatment of the return 
>> value from CFURL
>> 
>>    public func CFURLCreateCopyAppendingPathComponent(allocator: 
>> CFAllocator!, _ url: CFURL!, _ pathComponent: CFString!, _ isDirectory: 
>> Bool) -> CFURL!
>> 
>> Which briefly looking appears to be the same between corelib and OS X.
>> 
>> I'm not sure what the best way forward on these things is, though, as the 
>> corelib versions have seemed consistently improved, but presumably we still 
>> want maintain compatibility. Anyone have ideas?
> 
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