how to update using SalatDAO

gistfile1.scala

salat-core:master:0.0.8-SNAPSHOT> test:console
[info] Formatting 2 Scala sources {file:/home/rose/workspace/salat/}salat-core(test)...
[info] Compiling 2 Scala sources to /home/rose/workspace/salat/salat-core/target/scala-2.8.1.final/test-classes...
[info] Starting scala interpreter...
[info] 
Welcome to Scala version 2.8.1.final (Java HotSpot(TM) 64-Bit Server VM, Java 1.6.0_26).
Type in expressions to have them evaluated.
Type :help for more information.

scala> import com.novus.salat._
import com.novus.salat._

scala> import com.novus.salat.global._
import com.novus.salat.global._

scala> import com.mongodb.casbah.Imports._
import com.mongodb.casbah.Imports._

scala> import com.novus.salat.test.dao._
import com.novus.salat.test.dao._

scala> val theta1 = Theta(x = "x1", y = "y1")
theta1: com.novus.salat.test.dao.Theta = Theta(4ecc2760e4b07a91ffc8782b,x1,y1)

scala> val _id = ThetaDAO.insert(theta1)
_id: Option[com.mongodb.casbah.Imports.ObjectId] = Some(4ecc2760e4b07a91ffc8782b)

scala> val theRealId: ObjectId  = _id.getOrElse(error("Oh no the sky has fallen"))
theRealId: com.mongodb.casbah.Imports.ObjectId = 4ecc2760e4b07a91ffc8782b

scala> val updated = theta1.copy(x = "x2")
updated: com.novus.salat.test.dao.Theta = Theta(4ecc2760e4b07a91ffc8782b,x2,y1)

scala> ThetaDAO.update(MongoDBObject("_id" -> theRealId), updated, false, false, new WriteConcern)

scala> val updated_* = ThetaDAO.findOneByID(theRealId)
updated_*: Option[com.novus.salat.test.dao.Theta] = Some(Theta(4ecc2760e4b07a91ffc8782b,x2,y1))

scala> updated_* == updated   // WTF?  Why aren't they equal?
res1: Boolean = false

scala> updated_*.getOrElse(error("ahhhh another option")) == updated  // because it is an Option and it must be unwrapped!
res3: Boolean = true