Breaking changes, at this point, have a high bar for acceptance. I am failing 
to see how the downsides presented here are enough to warrant a change. 

Also:
> Developers who follow this rule may accidentally insert newValue or oldValue 
> in the wrong observer. It is not that uncommon

One example from a tweet doesn't seem convincing enough that this is not an 
uncommon problem. Are there more examples of people getting hurt by this?

Brandon 

> On Nov 30, 2016, at 5:40 PM, Erica Sadun via swift-evolution 
> <[email protected]> wrote:
> 
> Developers who follow this rule may accidentally insert newValue or oldValue 
> in the wrong observer. It is not that uncommon
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