anchor.diff:        let defaultOrder=
           { Id =0
             Company =defaultCompany
  -          EOrders=[|e1;e2|]}
  +          EOrders=[e1;e2]}
         File.Delete("simple.db")|>ignore
         let mapper = FSharpBsonMapper()
         mapper.Entity<Order>().DbRef(toLinq(<@fun c->c.EOrders@>))|>ignore
  
positive.code:       let defaultOrder=
          { Id =0
            Company =defaultCompany
            EOrders=[||]}
        File.Delete("simple.db")|>ignore
        let mapper = FSharpBsonMapper()
        mapper.Entity<Order>().DbRef(toLinq(<@fun c->c.Company@>))|>ignore
  
negative.code:       let defaultOrder=
          { Id =0
            Company =defaultCompany
            EOrders=[e1;e2]}
        File.Delete("simple.db")|>ignore
        let mapper = FSharpBsonMapper()
        mapper.Entity<Order>().DbRef(toLinq(<@fun c->c.EOrders@>))|>ignore
  