Github user zsxwing commented on the pull request:
https://github.com/apache/spark/pull/3378#issuecomment-63769414
It's weird. I just found both the sizes of old and new `CompactBuffer(1)`
are 56. I cannot explain why.
Then I added a field to the old CompactBuffer like this:
```Scala
class CompactBuffer[T] extends Seq[T] with Serializable {
val dummy: AnyRef = null
// First two elements
private var element0: T = _
private var element1: T = _
```
`println(estimateSize(CompactBuffer[Int](1)))` also outputs `56`.
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