You don't implement Map, you don't grow or shrink...
but at least now you return Interators and have a proper entrySet() method.
(Added a note that maybe someday we should fix it up more.)
git-svn-id: https://samskivert.googlecode.com/svn/trunk@1703 6335cc39-0255-0410-8fd6-9bcaacd3b74c