java.lang.IllegalArgumentException: can't serialize class scala.math.BigDecimal

TestLoadingJsNumber.scala

package test

import com.mongodb.casbah.Imports._
import org.scalatest._
import org.scalatest.matchers.ShouldMatchers
import play.api.libs.json._
import play.api.{Play, Logger}

class TestLoadingJsNumber extends FlatSpec with ShouldMatchers {

  "Trying to Insert a JsNumber" should "throw a BSON exception when trying BigDecimal serialization" in {
  	val collection = MongoConnection()("test")("test")
		
		val obj: JsValue = Json.obj("age" -> JsNumber(100))

		println("Json.stringify(obj): " + Json.stringify(obj))

		val q = MongoDBObject("name" -> obj)
		collection.insert(q)
  }
}

Note that replacing val obj... with the below line also throws a BSON serialization exception.

val obj: JsValue = Json.obj("age" -> 100)