Allowing an implicit conversion from OuterJoinedQueryable to OptionalQueryable will trigger another conversion to InnerJoinedQueryable inside org.
Allowing an implicit conversion from OuterJoinedQueryable to OptionalQueryable will trigger another conversion to InnerJoinedQueryable inside org.squeryl.dsl.boilerplate.JoinSignatures#join. This also allows us to inhibit the table without using Option[Option[T]] in our results