optionalEmbeddedField.scala

    class OptionalEmbeddedField[V](override val mongoFieldName: String, val g: T => Option[V], val p: Option[(T,Option[V]) => Unit])
            extends MongoScalar[V] with EmbeddedContent[V] with FieldModifyOp[V] with Optional[V] {
        self: MongoField[V] with ObjectIn[V, QueryType] =>
        
        override val rep = parent.Represented.byOption(g, p)
        override def canEqual(other: Any): Boolean = other.isInstanceOf[OptionalEmbeddedField[_]]
    }