Add a test for marshalling Hamster::Set instances. No changes are required here, as we never use Trie#get; all membership tests are done via #any?.
Add a test for marshalling Hamster::Set instances. No changes are required here, as we never use Trie#get; all membership tests are done via #any?.

jack-nie/hamster,alexdowad/hamster,xaviershay/hamster,dzjuck/hamster