On Nov 2, 2015, at 10:55 , Richard Charles <rcharles...@gmail.com> wrote:
> 
> Does anyone know how to fix this?

The simplest way is probably to create a derived property in your data model 
that is the correctly-rounded value to display.

Alternatively, I think you could write a value transformer:

        
https://developer.apple.com/library/prerelease/mac/documentation/Cocoa/Conceptual/ValueTransformers/ValueTransformers.html

(Note that this document was last updated in 2007. AFAIK it’s all still 
current, but a certain amount of caution is prudent.)

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