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The basic upgrade was too basic:
It didn't test different compression setting so missed issues such as - basho/eleveldb#273;
It didn't detect if compression wasn't working so missed issues such as - basho/eleveldb#275;
It tested too small a data set, and so could mask issues as only uncompressed parts of the file structure would be tested;
It didn't test updates between the upgrade and the downgrade.
This test should now be better at upgrade issues related to backend changes.