On Sep 14, 2017, at 09:07 , David Catmull <davidcatm...@gmail.com> wrote:
> 
> Are there any other options?

It looks like an unintentional error in the 10.13 SDK. If you look at other 
“enforcement” types, such as Notification.Name, they’ve been given a 
backwards-compatible availability, since they are value-compatible. (They have 
to be, because the Cocoa methods haven’t changed.)

I don’t see any immediate solution within Swift syntax. The only solution I can 
think of is to use an Obj-C “bridge", where you implement the override method 
in Obj-C, and have the override call a Swift method that doesn’t use the 
MaskMode type. (The old numeric masks are still available in the 10.13 SDK as 
deprecated global constants.)

Unfortunately, this is a bit messy to do. The cleanest way I can think of is to 
create a NSObject subclass (in Obj-C) that has the override and a dummy 
Swift-compatible replacement method that the override calls. Your class would 
then subclass this, and override the dummy method.

Make sure you submit a bug report. If the availability is intentional, then 
they need at least to be able to tell you how to write the override with 
backward compatibility.

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