Ah - thank you! I should read those release notes more carefully. Will close 
the bug I just filed.

> On Sep 6, 2018, at 3:56 PM, Jeff Nadeau <jnad...@apple.com> wrote:
> 
> This behavior changed in 10.12  for applications linked against that SDK or 
> later. It’s listed in the “Behavioral changes” section of the Core Data 
> release notes for that year: 
> https://developer.apple.com/library/archive/releasenotes/General/WhatNewCoreData2016/ReleaseNotes.html#//apple_ref/doc/uid/TP40017342-CH1-DontLinkElementID_10
>  
> <https://developer.apple.com/library/archive/releasenotes/General/WhatNewCoreData2016/ReleaseNotes.html#//apple_ref/doc/uid/TP40017342-CH1-DontLinkElementID_10>
> 
> There's a documentation bug to correct the information on the 
> NSManagedObjectContext class doc. I’ll give it a little bump.
> 
> Going forward, you can set the undoManager property with your own 
> NSUndoManager after you’ve initialized the context.
> 
> - Jeff
> 
>> On Sep 5, 2018, at 7:33 PM, Dave Fernandes <dave.fernan...@utoronto.ca 
>> <mailto:dave.fernan...@utoronto.ca>> wrote:
>> 
>> The docs say:
>> "In macOS, a context provides an undo manager by default; on iOS, the undo 
>> manager is nil by default.”
>> 
>> However, I am finding on macOS 10.13.6, the undoManager is always nil when 
>> creating a MOC. Is this new behavior expected for High Sierra, or is it a 
>> bug?
>> _
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