BitArray vs BitSet

[Nicolas]

Hello again,
There is also an other issue I would like to point out, Filter are BitArray
based, unfortunately the current implementation of BitArray doesn't provide
any mean to get its population (ot its 'cardinality' as defined in the Java
Bitsets). Does it make sense to you to replace System.Collection.BitArray by
another implementation that could provide this functionnality ?
Nicolas