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but that's like half the point of the containsKey() method! - check for shrinkage when values are removed from the keySet, but avoid doing iteration-breaking shrinking modifications when remove() is called on any of our iterators. - Slight performance improvement on keySet.remove(). - Other simplifications. git-svn-id: https://samskivert.googlecode.com/svn/trunk@2655 6335cc39-0255-0410-8fd6-9bcaacd3b74c