I watched DynamoDB change under my conformance suite

My DynamoDB conformance suite went red this week, and the test that failed was real AWS. That needs explaining. The suite runs a few hundred tests against real DynamoDB first, records exactly what the real thing does, then runs the same tests against the emulators people reach for locally - DynamoDB Local, LocalStack, Dynalite, my own engine - and scores how closely each one matches. Real DynamoDB…