[collections] dual list/set implementation?

[__matthewHawthorne]

I recently had to write a small class which followed the contract of 
java.util.List and java.util.Set... it maintained order and did not 
allow duplicates. 

I couldn't find such a class already in collections, did I miss it?  I 
thought I remembered a discussion about this a while back.

If not, is there interest in adding this class?



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