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Ref: 0.7.20070607.0 Release on a.m.o prefmanager.js
Line 49 return null;
Ref: Current trunk as of 2007 01 03 prefmanager.js
Line 52 return null;
There is a difference between null and undefined.
null is an object (e.g. alert(typeof(null));)
undefined has no memory allocated (e.g. alert(typeof(undefined));)
If the desired behavior is to return undefined, it will need to be corrected in the trunk as well as a.m.o.