Found a small bug when unregistering events: the collection of keys is 
being modified while being enumerated, so some keys are skipped. Did 
not add a unit test for this, since I don't really know how to make one 
for this (adding enough items would maybe show it, but that is not a 
good reproducable test). Anyhow, the fix is attached. Can you have a 
look, John?

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--
Roel Wuyts                                                   Software 
Composition Group
roel.wuyts at iam.unibe.ch                       University of Bern, 
Switzerland
http://www.iam.unibe.ch/~wuyts/
Board Member of the European Smalltalk User Group: www.esug.org