Github user marmbrus commented on the pull request:
https://github.com/apache/spark/pull/8382#issuecomment-136913496
Mixing it in isn't going to change the size of the class itself, and in
nearly all cases aren't we pulling in the outer class already?
```
scala> class A extends Serializable { val x = 1 }
defined class A
scala> org.apache.spark.util.Utils.serialize(new A).length
res3: Int = 140
scala> trait T { def y = 2 }
defined trait T
scala> class B extends T with Serializable { val x = 1 }
defined class B
scala> org.apache.spark.util.Utils.serialize(new B).length
res4: Int = 140
```
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