WRT NSValidatesImmediatelyBindingOption  the binding docs say:

Q
        A Boolean value that determines if the contents of the binding are 
validated immediately.

       If YES, the value is validated as it is entered. Otherwise, the content 
is validated only when the user interface item attempts to resign as the 
responder.
/Q

This seems quite misleading and somehow conflated with 
NSContinuouslyUpdatesValueBindingOption.

Reading the bindings message flow docs 
https://developer.apple.com/library/mac/DOCUMENTATION/Cocoa/Conceptual/CocoaBindings/Concepts/MessageFlow.html
it is clear that KVC validation ONLY occurs if this option is set.

Or have I got that wrong somehow?
Certainly I can only get my model bindings to validate if this option is 
enabled.

Jonathan











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