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
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
