Context

Describe the background behind the problem.

Definition of done

• Move the "operation.Count" type into the "mongo" package and unexport it. Rename the type to countOp.
  • Move the code to the "mongo/op_count.go" file.
• Remove all exported setter methods.
• Update all code to use the moved "mongo.countOp" type.
• Delete "x/mongo/driver/operation/count.go"

Pitfalls

What should the implementer watch out for? What are the risks?