- Entities in a hierarchy were returned once for each type in it, since a query
  for a base type already includes derived entities. Only root types are queried.
- An implicit many-to-many join entity is a shared-type entity, which Set<T>()
  cannot access, so AllData threw. Shared-type entities are queried by name.
- Rows were ordered in memory by a property named Id, leaving other keys in
  database order. Rows are now ordered in the query by the primary key.