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backed or unbacked FlowSet

hi,
according to the javadoc of FlowSet the toList()-method returns an
unbacked list. but the ArraySparseSet returns a backed list (again
according to the javadoc).
what is now the right implementation?
could you give a good definition of "backed" and "unbacked"
(dictionaries tend to forget these words...).
mfg
 florian loitsch
-- 
People who think they know everything are very irritating to those of us who do.
- Anon.