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Postgres9.3 doesn't have jsonb and so is incompatible with Django's
jsonb.JSONField
.This was meaning the tests wouldn't even run for me (Ubuntu 14.04), even though all except 2 passed without change - I've skipped those two if Postgres isn't new enough. It's slightly fiddly to get the Postgres version, but I think I've done it a reasonable way that will work for all/most modern Djangos.