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Why is copyWithZone: being called?

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Why is copyWithZone: being called?

Subject: Why is copyWithZone: being called?
From: T Reaves <email@hidden>
Date: Mon, 21 Feb 2005 13:20:13 -0500

	Hello all.

I am working on an application utilizing bindings. I have a UI page bound to a domain object via an NSArrayController - the domain object has only NS* data members - , and that works well. I then added a second domain object, and the first (bound) object no has the second domain object as a data member.

So I added the new keys to the NSArrayController using the dot notation (attribute.attribute). I then bound the new widgets in the UI to the new keys of the controller. Now, when I start the app, I get the error: *** -[Range copyWithZone:]: selector not recognized

I know how to implement copyWithZone:. What I do not understand is why I must. Why is it that when a domain object contains only NS* data members, bindings do not call copyWithZone:, but when a domain object contains other domain object data members copyWithZone: is called?

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