How to replace all ordered to-many relationships in NSManagedObject ios

Question

First, please note, I'm aware of the NSOrderedSet bug.

I think the issue I have is that I don't fully understand removeXXX:(NSOrderedSet*)values.

I want to replace and old ordered set with a new ordered set of objects.

What I would have thought is:

[object removeXXX];
[object addXXX:newSet];

So I don't understand the values passed to removeXXX:

Is it possible to merely set the property?:

object.relation = newSet;