From: Constantine Plotnikov <###@###.###>
To: jdkea <###@###.###>
Subject: WeakValueHashMap

I suggest to add class WeakValueHashMap in which key/value pair is
removed if value is no more referrenced. In my application (prolog
interpreter) I have many cases when it is very useful but I had not
any cases when WeakHashMap were useful. Such class can be used for
example for mapping string to loaded resources.