You can't pin DynamoDB to one region

A conformance suite is only as good as its ground truth. Mine works by running every test against real DynamoDB and recording what comes back, so the expected answer is never my reading of the docs - it's what the service actually did when I asked it. That only holds up if real DynamoDB does the same thing everywhere. It mostly does. Not always. Take PutItem with an attribute value of { NULL:…