Why does my Core Data app give me a validation error message, when quitting the 
app, if the following code is used? I am importing some legacy data to set 5 
string attributes of an object, but using this code to set the one BOOL 
attribute. In my model, myBooleanAttribute has a default value of NO, and the 
legacy data does not include this attribute, so I can avoid the validation 
error by omitting the following code, but I would like to know why it causes 
errors.

[myNewObject setMyBooleanAttribute: NO];
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