Kevin,
It was there to deal with the fact that we only wanted to keep weak references to something (I forget what, maybe something in in <ant>), but we couldnt do it with Java1.1 support. So we had to wrap up weak refs behind weakish references that switched between hard and weak refs depending on the runtime. This meant that 1.1 could leak memory on a big build, but later platforms would not.
It isnt in use since we moved to 1.2+, but hasnt been purged from the codebase yet. Something we ought to consider...
-steve
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