Github user garydgregory commented on the issue:
https://github.com/apache/commons-collections/pull/57
Hi @drajakumar ,
I'm not sure this patch makes sense. Take a look at
```org.apache.commons.collections4.list.Collections701Test```: For
```ArrayList``` and ```HashSet```, adding a collection to itself is fine.
In this patch, the argument is not only silently ignored, but the behavior
is not even documented. Whatever we do, we really need to document _anything_
that deviates from the standard JRE ```List``` contract.
IMO, the fix should be so that a ```SetUniqueList``` behaves like a
```ArrayList``` and ```HashSet```, it just works.
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