Dynoxide 0.11.1: four conformance fixes

Dynoxide 0.11.1 is a small patch. Four fixes, all the same shape: spots where the engine evaluated a condition expression or validated a number slightly differently from real DynamoDB. No new features - just drift the conformance suite turned up, most of it checked back against real AWS before I closed it. Map and list equality in a ConditionExpression . Comparing an M or L attribute with = always…